NO, he is not the composer of Mama don't, (even though a promo 7'' I have, gives him this credit) but surely his interpretation is the best! And "Shades" LP which includes it, also has Carry on, Cloudy day and Deep dark dungeon, which are amongst my favourites!
Thank you Superval and Pottel for the videos. I have all his albums and then some! A couple of bootlegs, live and compilations (just for the 2-3 new songs), singles and maxis. On his first 11 years of solo career (before his first record he had issued one with Leon Russell, in the mid 60ies, as "The Leathercoated minds" ) he delivered 8 fantastic records. A feature very few artists have accomplished. The harder to get into are Okie and Really, that are low - fi and in reality a different approach than the rest, while the others are almost immaculate! (2-3 weaker songs, in every album, but by no means bad, just weaker).
And yes, I can find resemblance with MK, (Banjo, I quite agree with you about BD) in some albums, like Grasshopper, but still it is a different compositional approach all together. MK's guitar skills, especially during the DS days, were the main attraction, while JJ always went for the song. And his style is fantastic, and when he delivers solos they are treats for the ears!
And maybe he is the first rock artist to be using (even from 1972!) a drum machine in his recordings!