Hi, I see your concern about the issue because when choosing the perfect bedroom design, you should keep in mind that it should have a thoughtful layout. Teenagers are quite demanding when it comes to any changes in their room. But as a general rule, include in your teens room the following things: much storage space, a comfy sleeping bed, a study place with enough light, and a stylish touch. So, I recommend to check out this amazing article about teen bedroom ideas glaminati.com/teen-bedroom-ideas/ and get some inspiration
Not an entire room from me, but you can definitely find little lamps/lights that are music signs, and do musical line decals on the walls. My parents let me paint my walls, so I personally have Acrylics of my favorite Lyrics, artists, and some basic signs, and that brings me to the last idea- put band/musician posters/ pictures up! Hope this helps :)