Hello, Danny G.
Danny Wilson may be helpful.www.bassharp.com
Al Smith has written about many harmonica bands in the past issues of Harmonica Happenings (SPAH quarterly), including the Cappy Barra Ensemble.
Also try to Google "The Cappy Barra Harmonica Band," or something like it, or just "Cappy Barra."
From "The Encyclopedia of the Harmonica," by Peter Krampert, Tatanka Publishing:
The Cappy Barra Harmonica Ensemble (or Harmonica Gentlemen)
Formed: 1935, New York City; Disbanded: 1944.
Vaudeville harmonica band
Assembled by promoter Maurice Duke and named after the cappybara, a large South American rodent, The Cappy Barra Harmonica ensemble specialized in playing big band arrangements on the harmonica.
Players in the group included Charles Leighton, Sam Schekter, Don Ripps, Phil King, Sam Sperling, Joe Mullendore, Leon Lafell, Nat Bergman, Phil Solomon, Alan Greene and Pro Robbins.
They made numerous radio and movie appearances, and had a lucrative career in Vaudeville. Most of the group disbanded after the outbreak of World War Two.
Movies: Mad About Music (1938); Pot O' Gold (1941); Rockin' In the Rockies (1945); Radio Stars On Parade (1945); Bowery Boy (1945).
The above listed book references the Cappy Barra group on 17 pages.
In the book, "Harmonicas, Harps and Heavy Breathers," by Kim Field, published by Cooper Square Press, The Cappy Barra group has a more complete biography of two and a half pages (small font). An excerpt from the Kim Field book:
"In 1940, Sam Schekter and Sam Sperling left the group, George Fields replaced Schekter. <snip> Shortly after, the act split into two groups. The first unit...worked primarily in the Chicago area, <snip> a second unit based in New York, was formed around Phil King and newcomers Fields, Charles Leighton, Alan Green and Pro Robbins."
"The New York unit worked steadily in Vaudeville and in nightclubs through the war years. George Fields left in 1941 to move to California, and the group played as a trio, with Leighton handling the lead, Alan Greene playing chord harp and singing, and Pro Robbins on bass harp. Phil King booked the band, played an occasional Polyphonia, did comedy bits, and fronted the group. The group disbanded in 1944."