Hi @joymatters you can submit any track you like, but you get bonus points if you are in taking part in the challenges. ;-) The whole focus for this is to take your music to a new level. And we have lots of artists in the community with the chops and experience to help you out in that regard. So If I were you, I would def give it a go, and submit a few tracks into the Challenges, it is quite fun. Have a great day.