How big is Texas’ contribution to the world of music? Big enough to overwhelm Dallasite Rick Koster’s attempt to contain the sprawl between two covers; his Texas Music (St. Martin’s, 1998) falls short of its ambition. Which raises the question: Can any one book possibly hope to encompass Lefty Frizzell, the Butthole Surfers, and Van Cliburn? Perhaps not, but the following is a roundup of books that any music maven should own.