Last weekend the Whitney Museum in New York had its 70th birthday concert for composer Steve Reich, featuring some of the city’s best new music groups (Alarm Will Sound’s transcriptions of Aphex Twin tunes are a must for anyone who loves geeky contemporary and geeky electronic music). Now they’ve posted the entire 4-hour concert on their site, in high-quality MP3s. It’s lovely music, hypnotic, a look back at much of the career of a composer that evolves like his music, almost imperceptibly, so listeners can never quite predict exactly what’s next.

Did I mention the Web rules?