What is dolly parten's best selling song?

Dolly Parton's best-selling song is "I Will Always Love You." Originally released in 1973, the song gained immense popularity after Whitney Houston covered it for the 1992 film "The Bodyguard." Parton's heartfelt Ballad has become a timeless classic, showcasing her exceptional songwriting talent and emotional depth. The song's enduring appeal has solidified its status as one of her signature hits.