Currently only the Gm can change the jukebox, and only by choosing the tracks manually, there is no access to the jukebox from the api as that is streamed from Soundcloud. If you think about it, it would be tough if 6 or 7 players were choosing their favorite music all at once. Given varied musical tastes, you could really wind up with some noise going on. I think there are suggestions to allow playlists, which would make it easier to set the mood. The Gm should really be the one setting the mood. You can overlay multiple tracks to create a soundscape, with some dramatic effects, using loops, and then throwing in accents as non-looping sounds at key points. Like the art search, you need to spend some time setting up music and arranging it to fit your game. If you don't have an account at soundcloud, you should get one, you can find a sound there and use the URL to search in roll20, and once in your library, clicl on the title, hit [home] and put your sorting scheme before the title and it will be easier to make sense of it all. Always hit [enter] when you are done and it will save and sort.