The Whitney Houston classic is the hallmark of The Bodyguard soundtrack. It sold over 45 million copies worldwide. I own a copy and even though I would not say it's a great soundtrack, “I Will Always Love You” makes up for any shortcomings.
The song was originally penned by Dolly Parton was a hit on country radio in it's original format, but it wouldn't become an iconic torch song until Whitney Houston covered it. The song stands alongside “My Heart Will Go On” as one of the cornerstone ballads of the 90s (sorry Mariah!).