The Basilica di Santa Maria Gloriosa dei Frari, usually just called the Frari, is a church located in the Campo dei Frari at the heart of the San Polo district of Venice, Italy. The largest church in the city, it has the status of a minor basilica. The church is dedicated to the Assumption of Mary.
The imposing edifice is built of brick, and is one of the city's three notable churches still mostly retaining their Venetian Gothic appearance. In common with many Franciscan churches, the exterior is rather plain, even on the front facade. The interior is notable for many very grand wall monuments to distinguished Venetians buried in the church, including a number of Doges and the painter Titian. Many of these are important works in the history of Venetian sculpture, and the many paintings include two large and important altarpieces by Titian, the Assumption of the Virgin on the high altar and the Pesaro Madonna. It also contains the only rood screen still in place in Venice.
In 1231, under Doge Jacopo Tiepolo, the city donated land at this site to establish a monastery and church belonging to the Franciscan Order of Friars Minor. This edifice proved too small and a three nave church was begun in 1250, and not completed until 1338. Work almost immediately began on its much larger replacement, the current church, which took over a century to build. The new church inverted the original orientation, thus placing the facade facing the plaza and small canal. The work was started under Jacopo Celega, but completed by his son Pier Paolo. The campanile, the second tallest in the city after that of San Marco, was completed in 1396. Under the patronage of Giovanni Corner, the Chapel of San Marco was added in 1420. In 1432-1434 the bishop Vicenza Pietro Miani built the chapel of San Pietro next to the bell-tower. The facade was not completed until 1440, with the cornice is surmounted by three statues (1516) by Lorenzo Bregno The main altar was consecrated in 1469. In 1478, the Pesaro family commissioned a chapel in the apse. On 27 May 1492, the church was consecrated with the name of Santa Maria Gloriosa.
The Frari is a parish church of the Vicariate of San Polo-Santa Croce-Dorsoduro. Other churches of the parish are San Barnaba, San Ludovico Vescovo, Santa Maria del Soccorso and Santa Margherita. The Franciscans had been expelled from the church during the 19th century, the church was restored to the order in 1922.
Titian, the most prominent 16th-century Venetian painter, is interred in the Frari. Pipe organs History The first news about the organ in the Frari basilica dates back to the 15th century. In fact, in 1483 a chronicle of the convent refers to the existence of a "perfectum" organ. Girolamo Diruta (1586-1589) and Giovanni Picchi in service for over thirty years, probably from 1593 at least until 1629, are among the most famous organists of the basilica. An engraving depicting the choir of the basilica, made by Father Vincenzo Coronelli in 1708, shows that at that time the basilica had two organs placed sideways on the choir stalls, facing each other, on the perimeter wall of the choir. [ 7] The left organ was probably built by Giovan Battista Piaggia in 1732: this instrument could therefore be one of his first works. The activity, known up to now, of this Venetian organ builder extends, in fact, from 1740 to 1760: the organ he built for the Venetian church of San Giovanni Evangelista dates back to that date and has remained almost unchanged; the latter therefore served as a term of comparison to validate the attribution of that of the Frari and, above all, to allow its reconstruction in 1970. In fact, after Gaetano Callido had built the front organ (1795), this instrument was progressively abandoned, so as to reach the early seventies almost completely stripped of the metal rods.
The right organ was built by Gaetano Callido in 1795/96. Almost uninterrupted documentation, up to the early decades of the twentieth century, allows us to know how this instrument, unlike the other, was entrusted to qualified organ builders for ordinary maintenance and, from time to time, restored with substantial respect for its authenticity.
The problem of restoring the two ancient organs was faced only in 1969: in fact, after the construction of the new Mascioni organ with electropneumatic transmission (1928), an organ located in the apse close to Titian's Assumption, the use of the Callido organ it decreased over time and, so much so that between 1929 and 1969 there were no maintenance interventions.
The restoration of the organs involved for the right organ, given the good conditions of conservation and integrity, an intervention of extraordinary maintenance; while a more radical intervention concerned the left organ: in practice, a reconstruction in the strict sense, since there were seven façade pipes, all the internal mechanics, nine wooden pipes and a bellows missing. For this reconstruction all the surviving elements were used and, on the basis of these, also making comparisons with the organ of San Giovanni Evangelista, the measures of the pipes were established.
Choir of the Friars, 1468, by the carvers Francesco and Marco Cozzi The restoration made it possible to appreciate again the round and robust sounds of the Callido organ and the transparent and delicate timbre of the Piaggia organ, closer to Renaissance sound models. The instruments were eventually tuned in unison to be played together. After more than thirty years, a new revision work was promoted, which was completed in the months of April and May 2004  .
The practice of the double choir is re-proposed in the basilica of the Frari, thanks to the availability of the two organs placed on two opposing choirs, typical of a musical style in vogue in Venice in the sixteenth and seventeenth centuries: that of the Frari is the last surviving example in Venice - and one of the rare in Italy - of two choirs with functioning historical organs  .
Piaggia organ The organ of the left choir, with original integral mechanical transmission, has a single keyboard of 45 notes with a first octave scavezza (C1-C5) and a pedalboard of 13 (C1-E2) with a first octave scavezza, constantly combined with the manual. . The exhibition consists of 21 pipes, belonging to the main register and forming a single cusp with side wings and with aligned shield mouths. The phonic arrangement, based on the position of the knob tie rods of the various stops in a column of the register (whose handwritten tags are original), is as follows:
Main 8 '
Human Voice 
Double basses 16 '(always inserted)
Callido organ On the right choir there is the pipe organ built by Gaetano Callido: it has an original integral mechanical transmission; it has a single 47-note keyboard with first octave scavezza (C1-D5) and a 17 + 1 pedalboard (C1-G # 2 + Rollante pedal) with first octave scavezza, constantly combined with the manual. The exhibition consists of 21 pipes, belonging to the main register and forming a single cusp with lateral wings and with aligned miter mouths, at the foot of which the tromboncini are housed. The disposition
The basilica also housed the Mascioni opus 398 pipe organ, built in 1928. 
It was placed behind the Assunta altarpiece of the main altar, it was electrically driven, had three keyboards of 61 notes each (C1-C6) and a pedalboard of 30 (C1-F3).
It was the largest organ in Venice, the only one with three manuals from the Cecilian period, the only instrument that allowed the performance of concerts with a repertoire that could range from the Romantic to the contemporary period.
Despite the transformation of the transmission from pneumatic to electric, the organ preserved all the pipes (about 2000), the bellows and the wind chests (with the exception of that of the third manual which was destroyed by high water during the restoration of the Pala Assunta in the 1960s), the beautiful wooden console table, with its original ivory keys.
In 2018, the organ, fully functional and active in liturgies and concerts, was disassembled to allow the complete restoration of the altarpiece and frame of the Assumption, with no idea of where to place it at the end of the restoration of the painting. In 1965 it had already been dismantled to allow the restoration of the altarpiece in a previous intervention: once restored, the organ had been rebuilt in 1977, many parts were destroyed, including the wind chest of the 3rd manual, but many other patios were resumed and reassembled because they were missing, some registers from the same period also made by Mascioni, the patient work was performed by Maestro Alessandro Girotto, the completed organ was inaugurated with a concert by the concert master Sergio De Pieri, then organist of the basilica. Now, however, the instrument has been generously donated to the parish church of Santa Maria Ausiliatrice in Lido di Jesolo (Venice) where it will be mounted (perhaps in 2022?) After the restorations and tampering necessary to try to adapt it to the new different location by of the Zanin di Codroipo company, leaving the city of Venice deprived of its only romantic-symphonic concert instrument.
Giambattista Pittoni, Hagar in the desert
Bartolomeo Bon the Virgin and St. Francis on the west front
Lorenzo Bregno tomb of Benedetto Pésaro
Girolamo Campagna,St Anthony of Padua
Girolamo Campagna, St Agnes
Donatello, St. John the Baptist
Tullio Lombardo, tomb of Pietro Bernardo
Antonio Rizzo, tomb of Doge Niccolò Tron
Jacopo Sansovino, St. John the Baptist
High altar showing Assumption of the Virgin by Titian
Paolo Veneziano, Doge Francesco Dandolo and His Wife Presented to the Virgin by Ss. Francis and Elizabeth
Alessandro Vittoria The Risen Christ
Alessandro Vittoria St. Jerome
Alvise Vivarini St. Ambrose and other Saints
Bartolomeo Vivarini St. Mark Enthroned
Bartolomeo Vivarini Madonna and Child with Saints
Monument to Antonio Canova
Monumento to Doge Niccolò Tron
Monumento to Doge Francesco Dandolo
Tomb of Claudio Monteverdi
Monument to Alvise Pasqualigo
Monument to Doge Giovanni Pesaro
Monument of Titian