Jim, 'Georgia Tom' recorded extensively with Tampa Red for Vocalion (on his own and as part of Tampa Red's Hokum Jug Band) from September 1928 through to February 1932. On one recording in Chicago in 1929 with Frankie Jaxon, the trio (Georgia Tom, Tampa Red and Frankie Jaxon) was recorded as 'The Black Hill Billies'! Another interesting piece of trivia is that Dixon and Godrich note that Tampa Red's real name was Hudson Woodbridge - the commonly believed real name of Hudson Wittaker was assumed.

In respect of photos on album covers, have a look at the instrument depicted on the cover of 'Violin Sing the Blues for Me: African American Fiddlers 1926-49' Old Hat CD-1002. It looks like a kazoo fashioned from a long-necked oil can.

Cheers, Stewie.