Songs that you first heard in a different form

All I Want For Christmas Is You: I've been well-aware of it for a while, but I first heard it during a dad-listening-to-music-on-the-computer session as the cover from Love Actually:



Then Dad accidentally went to the original by Mariah Carey before switching to it. From then I knew she was the original singer, and became her legit one-hit wonder (non-christmas songs by her will never be as popular as it). I should tell Dad about it...