First recorded by David Martin (1975).
First released by The Carpenters (1976).
Also recorded by Engelbert Humperdinck (1976).
Hit version by Barry Manilow (US #3/MOR #1 1978).
From the wiki: “‘Can’t Smile Without You’ was written by David Martin, Christian Arnold and Geoff Morrow, and was first recorded by Martin in 1975. The Carpenters covered the song on their 1976 album A Kind of Hush, and it was featured as the B-side of their hit ‘Calling Occupants of Interplanetary Craft’ the following year. Engelbert Humperdinck also recorded the song in 1976, using the same lyrics as the original Carpenters version, on his After the Lovin’ album.
“‘Can’t Smile Without You’ was the first single to be released from Barry Manilow’s 1978 album Even Now, reaching the #1 spot on Billboard’s MOR chart and the #3 spot on the Billboard Hot 100.”
The Carpenters, “Can’t Smile Without You” (1975):
Engelbert Humperdinck, “Can’t Smile Without You” (1976):
Barry Manilow, “Can’t Smile Without You” (1978):