Groove Merchant included which jazz vibraphonist as one of its artists?
Groove Merchant:  Notable artists included Chick Corea, O'Donel Levy, Buddy Rich, Jimmy McGriff, and Lionel Hampton. Lionel Hampton: Lionel Leo Hampton (April 20, 1908 – August 31, 2002) was an American jazz vibraphonist, pianist, percussionist, bandleader and actor.
Lionel Leo Hampton