I haven’t been able to uncover anything substantive about Cas Carr, but I dimly recollect that he was an African-American society bandleader in Chicago. His audiences certainly got their money’s worth with the doubling described above. This comes from a time when “art” and “showmanship” weren’t viewed as opposing forces. And several of these advertising photographs have been on sale through various book / antique dealers. I’d welcome more information.
May your happiness increase!