Part of an earlier breed of party bands, The Radiators presaged the current jam-band movement with their knack for incorporating multiple, groove-based genres into their live shows. The group, which does a 9 p.m. show at the Miramar Theatre tonight, is prone to all sorts of up-tempo, danceable tangents, but the true heart of the now 30-year-old group has always been the swampy, New Orleans “fish-head music” scene, as they call it, complete with gravelly nods to Delta roots and the unabashed lead guitars of classic rock. These guys love to stretch out a good, classic cover song.
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