Hmm @wolf_garcia, depends on what is meant by background. I had a session for one song for a movie soundtrack, and after the first take the engineer/producer asked me to play more like Keith Moon (of whom he was and remains a big fan). The singer (a grandson of one of The Lennon Sisters!) asked "Is that 60’s?" (the movie was set in that decade). The producer said "Oh yeah, The Who were in the 60’s."
So on the second take I played a little more aggressively, but not enough more to satisfy the producer. He suggested some fills in certain passages, and I said to him "That will walk all over the vocal." To my astonishment he then said "Oh, I don’t care about that." !!!!!
The next time I spoke with him he told me that after I left he had done a take with him doing his own drumming (he is a multi-instrumentalist), and submitted it to the movies soundtrack producer. That recording was rejected. He then submitted the take with my drumming, and it was accepted.
To me the focus of the song was the vocal, to the engineer/producer it was about playing in an extroverted style. I view it as a matter of musical appropriateness, and place musicality above all else. Keith Moon was musically perfect for The Who, but wouldn’t have lasted a week as a studio musician ;-) .