The riff comes from Blues legend John Lee Hooker's song "Boogie Chillen"
. Hooker was a big influence on Canned Heat, and in 1970 he even recorded an album with the band - titled, appropriately enough, Hooker 'N' Heat
- that featured a straight remake of "Boogie Chillen." The same riff would later be borrowed and adapted for a few other songs, among them "La Grange
" by ZZ Top and "Spirit In The Sky
" by Norman Greenbaum.
Joshua - Twin Cities, MN, for above 2