John Lennon plays I Feel Fine’s main riff on his Gibson while George Harrison sometimes doubles, and other times plays rhythm on his Gretsch Tennessean. At the time of the song’s recording, the Beatles, having mastered the studio basics, had begun to explore new sources of inspiration in noises previously eliminated as mistakes (such as electronic goofs, twisted tapes, and talkback). I Feel Fine marks one of the earliest examples of the use of feedback as a recording effect in popular music. Artists such as the Kinks and the Who had already used feedback live, but Lennon remained proud of the fact that the Beatles were perhaps the first group to deliberately put it on vinyl.