On a Berkeley street corner you may see them playing an assortment of traditional folk instruments. They may be dressed as circus clowns or resemble refugees from a 1930's rodeo. Oldtime American fiddle tunes of various origins predominate the collection of songs that might assault the ears of an unsuspecting passerby. Considerable vocal skills are applied to a variety of Sea Chanties, hillbilly tearjerkers. and other musical antiques. The sound waves emerge naturally from organic acoustic instruments with no added amplification.