Blending old-school R&B, church music, blues and Caribbean sounds in his compositions and piano playing, Horace was a leading hardbop pioneer. He was a founding member of Art Blakey's Jazz Messengers, helping introduce such talent as Donald Byrd, Art Farmer, Woody Shaw and Blue Mitchell. Horace has worked with greats like Coleman Hawkins, Lou Donaldson, Hank Mobley, Joe Henderson and Stan Getz. Horace continued to create high-quality jazz records through the 1990s.