Other works for the theater were a score for Euripides' "The Bacchae" (2009, directed by JoAnne Akalaitis), and "Kepler" (2009), yet another operatic biography of a scientist or explorer. The opera is based on the life of 17th century astronomer Johannes Kepler, against the background of the Thirty Years' War, with a libretto compiled from Kepler's texts and poems by his contemporary Andreas Gryphius. It is Glass's first opera in German, and was premiered by the Bruckner Orchestra Linz and Dennis Russell Davies in September 2009. LA Times critic Mark Swed and others described the work as "oratorio-like"; Swed pointed out the work is Glass's "most chromatic, complex, psychological score" and "the orchestra dominates ... I was struck by the muted, glowing colors, the character of many orchestral solos and the poignant emphasis on bass instruments".