Songs About Other Songs: What Are Your Favourites?

Have you noticed that there are a lot of songs out there that mention other songs?

Some songs reference songs musically, quoting parts of the melody, ripping off riffs intentionally. There’s Neil Young’s Borrowed Tune which ends up announcing that he has ripped off (parts of) the tune from elsewhere: “I'm singin' this borrowed tune/I took from the Rollin…