Dinosaur Jr: The Forum, London

IT MAY tell us something about the sorry state of contemporary rock, but at least one semi-legendary cult band from the 1980s seems to reform every other week to show the young pretenders how things should be done. Some of these reunions have proved anti-climactic, but a live comeback by Dinosaur Jr. was always guaranteed to make an impact, if only because of their famously cataclysmic volume. At the first of two London shows on Wednesday, the former Boston college rockers left ears not just ringing but bleeding.