First recorded by Keely Smith (1967).
Hit versions by Rosemary Clooney (MOR #28 1968), The 5th Dimension (US #2/MOR #1/R&B #4 1970).
From the wiki: “‘One Less Bell to Answer’ is a song written by Burt Bacharach and Hal David (“The Look of Love“, “I’ll Never Fall in Love Again“, “Alfie“), originally written for and recorded in 1967 by Keely Smith (‘I’m a Gigolo’, with Louis Prima). The song was rediscovered in late 1969 by Bones Howe, the producer for The 5th Dimension, and the song was included on the group’s 1970 debut album for Bell Records, Portrait. Rosemary Clooney had, a year earlier, in 1968, charted the song on Bilboard’s Easy Listening chart – one of the two last recordings she made before her nervous breakdown (after witnessing Robert Kennedy’s assassination).”
Rosemary Clooney, “One Less Bell to Answer” (1968):
The 5th Dimension, “One Less Bell to Answer” (1969):