‘Neil banging out the tunes’ refers to an image of a bald-looking rat in front of a toy keyboard captioned ‘Neil banging out the tunes April 13th, 2006’. It has become particularly popular in the Lemon Demon fandom, as Neil Cicierega shares a name with this meme.
Tumblr poster: holy shit it’s April 13th you know what that means
Everyone else: oh no
Neil banging out the tunes: hi