Rock music in 2011 is not quite what it was in the mid-1960s. For one thing, it is full of challenging coincidences, such as the one reported by Pete Townshend in a recent e-mail. “I was supposed to be sailing in the St Barth’s Bucket Race on March 24th,” he wrote. That’s right: the writer of “My Generation”, “Substitute” and “Won’t Get Fooled Again” now spends part of his time as a yachtsman in the Caribbean. “This was arranged last August,” he added. “In a challenging coincidence Roger Daltrey will be performing ‘Tommy’ on that very day for Teenage Cancer [Trust] at the Royal Albert Hall.”