The Dead's legendary 1972 European run began and ended in London. In between, they'd gone everywhere from Denmark to France, refining new material like the dazzling, bluesy "He's Gone," and perfecting the art of tossing hash pipes out the bus windows while crossing borders. So by the time they returned to London for a four-night stand at the old Lyceum, they were one groovy, well-oiled machine, reaching an all-time high for the finale on May 26. Only one problem: one of the mics needed adjusting