If rock 'n roll is a laboratory for new ideas and sounds, mutated with traditional modes, then are the Yardbirds not the greatest and maddest of scientists. Still mixing the traditional with the outrageous, the new with the old. Just as the original outfit gave flight to Clapton, Beck and Page, today's Yardbirds give flight to a prodigiously talented flock in the form of Ben King, Andy Mitchell and Dave Smale.