Sessions has a Leveling system in place, and we rank our Artists based on the number of Artist XP they managed to grab over a period of the last 10 weeks. Every week, you're going to be ranked based on this factor (with a higher number of Artist XP resulting in better results), and be put into one of 19 Artist Levels.
Each Artist Level gives the ability to unlock unique rewards and bonuses exclusive to that Artist Level or above.