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 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 its way to 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).