Written and first recorded by Loggins & Messina (1973).
Hit version by Anne Murray (US #12/C&W #5/CAN #1 1974).
From the wiki: “‘A Love Song’ was first recorded and released by Loggins & Messina on their 1973 album Full Sail but had been written by Kenny Loggins and Donna Lyn George specifically for Anne Murray who, a year earlier, had had great chart success with another Loggins composition, ‘Danny’s Song‘. ‘A Love Song’ was later recorded and released in late 1973 by Murray as the second single from her album Love Song. Her version would go on to win a Grammy award in 1974 for Best Country Vocal Performance.”
Anne Murray, “A Love Song” (1973):