During its six-year stretch in the late ’60s and early ’70s, Os Mutantes created some of the very best recordings of Brazil’s psychedelic tropicalia movement—not to mention the very worst. The most unlistenable offense was Tecnicolor, an attempt to reach American audiences by reworking earlier gems with English lyrics that, fortunately, the band kept in the vault (until 2000, that is). D.C.’s Alma Tropicalia pays tribute to Os Mutantes’ genre but hasn’t followed its most egregious lead: It has a Brazilian vocalist, Bebel Delgado, and she sings strictly in Portuguese. Expect interpretations of pop-nerd standards by Caetano Veloso, Gal Costa, and others, and—if past shows are an indication—trippy projected visuals. Remember, though: If you don’t sing along during Os Mutantes’ “Bat Macumba,” you’ve just wasted eight bucks.

ALMA TROPICALIA PERFORMS WITH WATERMELON AND COPPERTONIC AT 9 P.M. AT VELVET LOUNGE, 915 U ST. NW. $8. (202) 462-3213.