Single tickets for the Chicago Symphony’s 2009-2010 season go on sale today. I trust that Riccardo Muti’s leadership of Brahms’s German Requiem needs no blogosphere-inspired inducement, but feel strongly that pianist Paul Lewis’s CSO debut with Mozart’s Piano Concerto No. 12, Redmoon Theater’s giving an assist to Tchaikovsky’s Swan Lake, Boulez’s conducting Boulez (and The Firebird), Ruth Crawford Seeger and Alban Berg under Michael Tilson Thomas’s direction, Fauré’s lovely Masques et Bergamasques, and a new work by Mason Bates with choreography by Alejandro Cerrudo of Hubbard Street Dance Chicago and led by Esa-Pekka Salonen, each do.