Green’s Dictionary of Slang

a vibraphone or vibraharp.

1938		Pic (N.Y.) Mar. 7: jibing the vibes or hitting the harps. — playing the vibraphone.
1966		(con. 1958) R. Farina Been Down So Long (1972) 96: He gave a little of the Mojo mixture [...] to Spider Washington, who blew vibes.