Откуда пришла идея знаменитых вокально-гитарных дуэлей Гиллана и Блэкмора?

Roger Glover
(alt.music.deep-purple, 09.1998)

       "I've seen various stories about this. Odd how time changes things. ;-) I distinctly remember raving to the rest of the band about Edgar Winter's album "Entrance" when we were down in Devon during the writing sessions for Fireball. In particular his version of Tobacco Road at the end of which he does a startlingly long, contolled scream. IG had screamed before but this was inspirational. I still have the album, and it still sounds great."