Written and first recorded by Don McLean (1970).
Hit versions by Bobby Goldsboro (MOR #8/C&W #48 1971), Perry Como (US #29/MOR #1/UK #3 1973).
From the wiki: “‘And I Love You So’ is a popular song written by Don McLean and released on his 1970 debut album, Tapestry. In 1973, the song was an international hit for singer Perry Como on his album of the same name, And I Love You So. Como’s version of the song reached #29 on the Billboard Hot 100 chart, the last of his many popular recordings to reach the Top 40. In Britain, the record reached #3 on the UK Singles Chart.”
Bobby Goldsboro, “And I Love You So” (1971):
Perry Como, “And I Love You So” (1973):