In 1971, Colin Davis departed to take up the post of Music Director at Covent Garden, and was succeeded by the composer and conductor Pierre Boulez. There was also a change of chorus master: in 1972 Peter Gellhorn was succeeded by John Poole, who directed several of the concerts in this period, including Dvořák's "Te Deum" and Bruckner's F minor Mass. The Boulez repertoire, as with the BBC Symphony Orchestra, was immediately distinctive: Schoenberg's "Gurrelieder" was given several performances, and became a commercial recording for CBS Records. Stravinsky, Ravel, Debussy and Mahler were prominently featured, while of the romantics Berlioz, Schumann (the "Scenes from Goethe's Faust") and Brahms (the "Requiem") all appeared more than once. During this period the Society sang under many guest conductors: the young Andrew Davis made his unexpected London debut with them in Janáček's "Glagolitic Mass"; Lorin Maazel returned to conduct some highly successful concerts; John Pritchard conducted several events including Rachmaninov's "The Bells"; and an increasingly large number of important occasions were undertaken by the Chorus Master, John Poole.