FEWER.
Had a mad crush on Marilyn McCoo in the old days. This was the beginning of the end of my inflexible attitude toward grammar.
If Bert Bacharach and Hal David favored "one less bell" who am I to object?
'The title was born from working on 'What's New Pussycat', and Angie Dickinson was living with me in London. A doorbell rang, and I think she made the comment, 'One less bell to answer, when I get out of here.' It was pretty intense, and it bothered her. We weren't married yet but we were living together. I think Hal heard her say, 'One less bell to answer'. He thought, that's a good song title and we wrote it."'
—Bert Bacharach via Wikipedia
5th Dimension - ONE LESS BELL TO ANSWER
https://www.youtube.com/watch?v=jft060DznuU&list=RDMM