Can I download music to my sprint rant that isn't from the sprint music store?

Sure. You can download music onto your computer and transfer them over to your rant. Just use the included usb cable to do so. The only other places i would download music from would be fun4mobile dot com and that is about it. The good part is that it's free. It sends the ringer to you as a text message. It just has a bunch of ringers and little pieces of songs not full length songs. Hope that answers the question.