It is not so odd that I have seen this short, as I'm always curious about the old one or two-reelers, and used to catch some back in the late 1940's and early 1950's in my neighborhood movie houses. Hence I immediately bought the laser-disc box sets when they were issued (I think they go for $500 now or some such ridiculous price). Movie Mania is on Vitaphone Shorts: A 70th Anniversay Celebration, a/k/a Cavalcade of Vitaphone Shorts Volume 2 (MGM/UA ML 105220).
Anyway, to get to the point: it is always strange to see an old-timer one has never heard of, when it is evident from the setting that he had a following back in the day. One assumes that if you've heard of Eddie Cantor, Pete Smith, and a few dozen others, you know the lay of the land. But people like Dave Appolon keep popping up. (One of my laser shorts collections has an extended one-man slapstick vaudeville act done by a man so obnoxious, not to mention unfunny, that it's hard to believe he would be invited for dinner, let alone cut a swath in show biz.)
Can't say I like Mr. Appolon. He is clearly master of his instrument, the mandolin, which puts me in mind of one of my friend's favorite put-downs: "it's like being the world's best accordianist". Of course, I don't want to sound or even be a philistine; all music is good, right? Then there's Appolon's personality; he projects himself as an imperious Russian. Just how large was his following? Not worth researching, to me. Now compare a team unknown today: Olson and Johnson. Geniuses who anticipated all the fancy post-modern doo-dads that wow the college circuit -- just catch Hellzapoppin.