The band that accompanies Buster Poindexter is considerably more coherent than some of the lyrics he sings.

There were a cheery calypso called ''Everybody's Going Cannibal'' the period piece ''Blonde on a Bum Trip,'' and the strangest song ever recorded by the celebrated New Orleans pianist, Professor Longhair, ''Her Mind Is Gone.'' But strangest of all was a cocktail lounge rhumba that began, ''Don't change your basic patterns, as weird as they may be. Some of the songs Buster Poindexter sang last weekend at Tramps were a bit bizarre. They go over with the rock-and-roll crowd, but songs like 'Life Is Just a Bowl of Cherries' wouldn't do.'' Some of the early rhythm-and-blues things we do, like the songs Leiber and Stoller wrote for the Coasters, I also do as Johansen. We did a song I liked from a Chet Baker album, 'Deep in a Dream,' and 'Theme From ''The Valley of the Dolls.'' ' But more recently, we've been pandering to the masses by doing more songs with a beat. Johansen noted, ''the Poindexter show was more ballad-oriented. Tramps is at 125 East 15th Street, just east of Irving Place. The number to call for details and reservations for Buster Poindexter's last stand - for a while, anyway - is 777-5077. Then he will go on tour with his rock band to promote ''Sweet Revenge,'' a new David Johansen album, to be released next month. He will be performing at the club tonight and tomorrow night and over the next two weekends. People do seem to like Buster Poindexter, and his weekend shows are usually crowded. People seemed to like it, so we started doing two nights a week, and finally we started playing here on weekends.'' So about a year ago I got together with Joe Delia, who plays keyboards in my rock band, and we worked up some songs. Johansen explained, ''and Monday nights were always slow in here. ''I live just a couple of blocks from Tramps,'' Mr.

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