Glass describes himself as a "classicist", pointing out he is trained in harmony and counterpoint and studied such composers as Franz Schubert, Johann Sebastian Bach, and Wolfgang Amadeus Mozart with Nadia Boulanger. Aside from composing in the Western classical tradition, his music has ties to rock, ambient music, electronic music, and world music. Early admirers of his minimalism include musicians Brian Eno and David Bowie. In the 1990s, Glass composed the aforementioned symphonies "Low" (1992) and "Heroes" (1996), thematically derived from the Bowie-Eno collaboration albums "Low" and ""Heroes"" composed in late 1970s Berlin.