TUG is all about user creations. The entire concept behind the game is making a world in which players can shape land and social structures according to their desires. So it makes sense that the game is looking to see if the more musically inclined community members would like a chance to get their compositions into the game. Because even if the game has plenty of songs for play, there's always space to fit in some talented fan productions.
Currently the team at Nerd Kingdom is gauging interest in the idea, which would play a random selection of fan-made music on the game's menu screen. The piece played would include the composer's name, the title, and a link to where more of the composer's music could be found. It's not payment, but if you think you'd benefit from the exposure, feel free to take a look and express your interest.