What is George Morrow's primary instrument?

George Morrow's primary instrument is the bass. He was known for his skillful playing in the jazz genre, particularly during the mid-20th century. His contributions to jazz included not only performing but also being part of important ensembles, influencing the sound and style of the music during that era. The bass plays a crucial role in jazz as it provides the harmonic foundation and rhythm, which Morrow exemplified in his performances. While other instruments listed are significant in jazz, Morrow's expertise and recognition specifically stem from his work on the bass.