I suggest adding some possible tech, skill, and/or research trees (besides the standard 4 skills). The skill tree could include coordination, time management, persuasion/negotiation, etc. The tech tree could be comprised of various heavy metal, percussion, string, and voice performance techniques. A research tree could also be added to give perks or provide something for the musicians to do when not writing songs, busking, or performing. Loving the game so far and excited to see new and upcoming improvements!