The Jukebox is a new tile in the Exxo Avalon source mod. It, when right-clicked, brings up an interface that allows the player to choose a tune to play from the 30+ tunes in the game.
To craft the Jukebox, bring 1 of each of the following to a bookcase first: Title, Desert, Snow, Space, Crimson, Dungeon, Plantera, Temple, Eclipse, Pumpkin Moon, and Frost Moon music boxes. Then, bring that along with: 2 regular music boxes, 20 Pixie Dust, and 10 Souls of Flight to a Bookcase.
Currently the Jukebox has a bug in Multiplayer that prevents other players from hearing a tune another player has selected.