The hottest video online today is a version of the song, "I Will Always Love You" from a Chinese version of American Idol:
The Chinese video, and most other sources, identify this as Whitney Houston's song, because of the popularity of her version, from the movie The Bodyguard:
The song, however, was written by and first made a hit by Dolly Parton in 1974. She wrote the song about her breakup with longtime musical partner and mentor Porter Waggoner. Here's an early performance of the song on the Porter Waggoner Show from 1974:
According to Wikipedia, Kevin Costner brought Linda Rondstadt's version of the song to Whitney Houston's attention, which inspired her to record it.
Finally two more videos featuring Dolly Parton. The first one, from the movie The Best Little Whorehouse in Texas, represents what I think is the most accurate sentiment from the song -- a love that simply won't work for the people involved:
This last video is what I consider one of the most beautiful duets of the song (Dolly has performed this song with others a million times over the years.) She recorded it with Vince Gill and had yet another hit with the same song: