The Texas rock & roll outfit Blackwell released four singles in two years on the interstellar Astro label, but the band's star never got much beyond regional gazing. John "Rabbit" Bundrick, a keyboard noodler, is the one member of the band to mingle with international rock stardom as a member of Free and part of the Who's outer circle of musical accomplices. Vocalist Glenn Gibson, not to be confused with a well-worn songwriting pseudonym of the '50s...