Bass.
Like Dick Wilson, Alvin Redrick “Junior” Raglin toured with Gene Coy’s Black Aces but his name began to began to appear in Seattle concert listings around 1938, in particular at the Ubangi Club and the 411 Club. He had played guitar with Coy, but switched to bass in Seattle. For a while Raglin played in a sextet with Palmer Johnson and tenor sax man Aaron Davis at the Congo Club. Raglin also played in a duo with guitarist Milt Green. In 1941, he left Seattle to replace Jimmy Blanton in the Duke Ellington band, playing and recording many of the famous Blanton solos, such as the one on “Jack the Bear.”
Jackson Stree After Hours (print). https://en.wikipedia.org/wiki/Junior_Raglin