I have a variation on this theme. One of my all time favorite ballads is called "Pretending To Care" by Todd Rundgren. It's a demanding vocal that's been covered many times, including at least once by an operatic soprano whose names eludes me at the moment. So, one day I hear an incredible version of the song on the radio and don't get the name of the singer or source of the track.
Per this thread, it took many years to track down the singer and album - turns out it's a guy call Fred Froom from a long out of print Rundgren tribute album called "For The Love of Todd". Of course I grab a used copy on eBay and confirm that it is indeed a grand slam cover of the song.
Weird bonus factoid - An Internet search of Fred Froom yields only one piece of information:
Fred Froom covered the song "Pretending To Care" on the tribute album called "For The Love of Todd".
Other than that, this guy seems to be a ghost. A search of Mitchell Froom shows no relative called Fred. Evidently, Fred Froom is a terrific singer who for reasons unknown seems to have had a one song career.