First released by Samantha Sang (recorded 1977, released B-side 1978).
Hit version by Eric Carmen (US #19/MOR #6/CAN #14 1978).
From the wiki: “‘Change of Heart’ was written by Eric Carmen. It was first recorded in 1977 by Samantha Sang for her album, Emotion, and released as a single in April 1978 as the B-side to ‘You Keep Me Dancing’ (US #57), the follow-up single to her Top-10 international hit Emotion.
“Carmen released ‘Change of Heart’ in September 1978 as the lead single to Change of Heart, his third solo album (after leaving The Raspberries), with Sang on backing vocals.”
Eric Carmen, “Change of Heart” (1978):