Canvas The Gallery- Video game

So I am looking to hire a musician to do a song for my small indie game. In my game, Canvas The Gallery, you are given a blank art studio, a spray can and let loose. You can spray and draw whatever you want. The game will later be sold for money, so you have to be okay with me using your song in a commercial project. Song type: 1. Light piano 2. Peaceful feeling 3. Fills the player with creative passion, drives them to continue painting. The game currently has no music, and I am looking to do something unique for it. I would like the music to pick up the more you paint, so if you start spraying alot, the music picks up with you. When you stop, the music slowly dies down. As such, I am looking for a song that will sound good when slowed down/sped up. I do not know alot about music, so i'm afraid I cannot give more guidance on technical details Technical requirements: 1. The song must sound good at an original BPM and then sped up. 2. The song should be able to fade out at any point 3. The song must be greater than 1 minute long 4. The song must be loopable. So if the player continously paints, I do not want the music to stop and then start again. Maybe divide the song into say, a 15 second intro, 45 second body, 15 second ending, and then I can just play the intro, loop the body until the player stops painting, then play the ending. Note: I will handle the speeding up, slowing down, fading out from my side on a programming standpoint. A great song that encompasses what i'm talking about is "Photograph" by arcade fire. [login to view URL] Imagine this song along with the game, initially the player just begins to paint. Then they get an idea in there head, and let the painting take control. The music picks up with them. Near the end, they are just putting on the final touches, and the music slowly dies out. Payment: We can discuss what you think is appropriate, I am willing to pay some up front, some when given a 15-20 second cut, and then the rest when finished. Or whatever you want to do.