 While Gillespie was with Cab Calloway, he practiced with bassist Milt Hinton and developed some of the key harmonic and chordal innovations that would be the cornerstones of the new music; Parker did the same with bassist Gene Ramey while with McShann's group.Guitarist Charlie Christian, who had arrived in New York in 1939 was, like Parker, an innovator extending a southwestern style.Christian's major influence was in the realm of rhythmic phrasing.