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Frankly, I'm not even sure if this is a trope...
Anyway, when an artist sings a song, (usually) their voice is hitting notes and playing out a melody based in the pitch of their voice. What's it called when there's a version of the song with no vocals, and instead an actual instrument is inserted to play the notes that the singer would normally hit? I know there's such a thing as an instrumental version of a song, but it seems like that could cover both what I'm looking for and versions where the voice track is just absent (like in karaoke).