Happy birthday to the marvelous Steve Reich, who turns seventy today. The occasion will not pass unnoticed: the Boosey & Hawkes Reich page lists performances tonight in Bristol and London, UK; Vancouver, Canada; Freiburg, Germany; Helsinki, Finland; Evanston, Illinois; Brooklyn, NY (at BAM); and the Synagoge in Graz, Austria. A huge Reich @ 70 festival is unfolding all this month in NYC, with events at Carnegie, Lincoln Center, BAM, and the Whitney.