Peter Green revealed in a 1994 interview that he wrote "Oh Well Part 2" first, intending to release the song as the A-side. Inspired by some Spanish guitar playing he heard on the radio, he purchased a Ramirez Spanish guitar specifically for "Oh Well Part 2". Soon after, he wrote "Part 1" as a throwaway riff for the B-side. "Part 1" ended up on the A side against Green's wishes, and became a worldwide hit.[2] (Wikipedia)
Was it the correct decision of the A&R manager?