a piece for reciter and piano which in turn developed into a music theatre piece for singers and ensemble, Hydrogen Jukebox (1990). Glass also returned to chamber music; he composed two String Quartets (No. 4 Buczak in 1989 and No. 5 in 1991), and chamber works which originated as incidental music for plays, such as Music from "The Screens" (1989/1990). This work originated in one of many theater music collaborations with the director JoAnne Akalaitis, who originally asked the Gambian musician Foday Musa Suso "to do the score [for Jean Genet's The Screens] in collaboration with a western composer". Glass had already collaborated with Suso in the film score to Powaqqatsi (Godfrey Reggio, 1988). Music from "The Screens" is on occasion a touring piece for Glass and Suso (one set of tours also included percussionist Yousif Sheronick ), and individual pieces found their way into the repertoire of Glass and the cellist Wendy Sutter. Another collaboration was a collaborative recording project with Ravi Shankar, initiated by Peter Baumann (a member of the band Tangerine Dream), which resulted in the album Passages (1990). In the late 1980s and early 1990s, Glass's projects also included two highly prestigious opera commissions based on the life of explorers: The Voyage (1992), with a libretto by David Henry Hwang, was commissioned by the Metropolitan Opera for the 500th anniversary of the discovery of America by Christopher Columbus; and White Raven (1991), about Vasco da Gama, a collaboration with Robert Wilson and composed for the closure of the 1998 World Fair in Lisbon. Especially in The Voyage, the composer "explore[d] new territory", with its "newly arching lyricism", "Sibelian starkness and sweep", and "dark, brooding tone ... a reflection of its increasingly chromatic (and dissonant) palette", as one commentator put it. Glass remixed the S'Express song "Hey Music Lover", for the b-side of its 1989 release as a single. 1991–1996: Cocteau trilogy and symphonies After these operas, Glass began working on a symphonic cycle, commissioned by the conductor Dennis Russell Davies, who told Glass at the time: "I'm not going to let you ... be one of those opera composers who never write a symphony". Glass responded with a pair of three-movement symphonies ("Low" [1992], and Symphony No. 2 [1994]); his first in an ongoing series of symphonies is a combination of the composer's own musical material with themes featured in prominent tracks of the David Bowie/Brian