in Spring of 1786, led by his son Carl Philipp Emanuel Bach at a benefit concert for the Medical Institute for the Poor in Hamburg. One of Bach’s admirers Joseph Haydn had a copy of the work along with The Well Tempered Clavier. 19th century As recounted by George Stauffer, the next documented performance (not public) in the nineteenth century was when Carl Friedrich Zelter—a key figure in the 19th-century Bach revival—led the Berlin Singakademie in read-throughs of the "Great Mass" in 1811, covering the Kyrie; in 1813 he led read-throughs of the entire work. The first public performance in the century—of just the Credo section—took place in Frankfurt in March, 1828, with over 200 performers and many instrumental additions. In the same year in Berlin, Gaspare Spontini led the Credo section, adding 15 new choral parts and numerous instruments. A number of performances of sections of the Mass took place in the following decades in Europe, but the first attested public performance of the Mass in its entirety took place in 1859 in Leipzig, with Karl Riedel and the Riedel-Verein. The first performance of the Mass in the UK was given by The Bach Choir, newly formed for this purpose by conductor Otto Goldschmidt, in 1876 in St James's Hall, London. 20th century The Bach Choir of Bethlehem performed the American premiere of the complete Mass on March 27, 1900, in Bethlehem, Pennsylvania, though there is evidence that parts of the Mass had been performed in the United States as early as 1870. From early in the century, authors such as Albert Schweitzer, Arnold Schering, and Frederick Smend called for smaller performance forces, and experiments with (relatively) smaller groups began in the late 1920s. The first complete recording of the work was made in 1929, with a large choir and the London Symphony Orchestra led by Albert Coates. As of 2013, a database lists over 200 recordings with many different types of forces and performance styles. The work has played a central role in the 'historical performance movement' : Nikolaus Harnoncourt made the first recording with "period instruments" in 1968, his second Bach choral recording. Joshua Rifkin's first recording using the one-voice-per-part vocal scoring he proposes was made in 1982, and won a 1983 Gramophone Award. Significance The Mass in B minor is widely regarded as one of the supreme achievements of classical music. Alberto Basso summarizes the work