I wont lie, between the view-count and subscriber count... I didn't have high hopes for this song. However, how wrong was I proven... This was absolutely amazing, and I'm genuinely glad the RU-vid algorithm dropped me off here. Kudos, and I hope you continue to make music.
You totally can, although I'm not 100% sure on the copyright laws surrounding remixes. You (and myself as well) may need permission from the original copyright holders (i.e. Disney)
Well, you have my permission, but you (and ergo probably me as well) may need the permission of the copyright holders of the original theme (i.e. Disney).