Who Originally Performed Don'T Leave Me On The Official Soundtrack?

I get the confusion—there are a surprising number of songs called 'Don't Leave Me', so the performer on an "official soundtrack" depends entirely on which soundtrack you're looking at. If you mean a mainstream pop/R&B track, one of the best-known original recordings titled 'Don't Leave Me' was by Blackstreet from their mid-'90s era (it's on their album 'Another Level'). That might show up on compilations or movie trailers that pull from that period.

If you're talking about an anime, game, or film OST specifically, though, it could be an entirely different track with the same name performed by a Japanese or indie artist. The quickest way I find the original performer is to check the official soundtrack credits—either the CD booklet, the digital booklet on services like Apple Music, or the "Show credits" section on Spotify. IMDB and Discogs are also lifesavers for obscure OST credits. If you have a screenshot of the track listing or the album cover, posting it in a fan group usually gets a fast, accurate ID.

So, without the exact soundtrack title I can't pin down a single original performer for 'Don't Leave Me', but Blackstreet is a common original performer people mean when they ask that casually. If you tell me which movie, show, or game the soundtrack is from, I can dig in and give you the exact performer and even a link to the track.