Lead Belly's song about the Titanic and Jack Johnson was posted by gargoyle IN THIS THREAD.

Tom Russell's 'Jack Johnson', mentioned above, is about the same incident with a nod to Lead Belly:

Yonder comes Jack Johnson
Well I stole a line from Lead Belly - I don't think he'd mind
'Cause Lead Belly and Jack they were cut from the same vine

It is on The Tom Russell Band 'Hurricane Season' Philo CD PH 1141.

The gospel group headed by J.C. Ginyard, The Dixiaires, recorded a piece called 'Joe Louis is a fightin' man' in 1947. Arhoolie reissued it on its Folklyric label on an album titled 'Golden Age of Gospel Singing' [Folklyric 9046].

--Stewie.