What classes to take in high school?

ok so next year im going into grade 8. Im in french immersion tho so a ton of classes r mandatory. I can only choose 1 class. I can choose between Mosaic fine arts 8 which is Art, Drama, Computers and Health and career. I can also choose Concert Band but I can't do that cuz i dont play and instrument. Theres also Beginning concert band. I always have wanted 2 be a singer. I do have a good voice and I really want 2 learn how 2 play guitar 2. Problem is that its very hard 2 get in the music career and I know that. I kinda want 2 be a nurse 2. So what class should I take??? oh i am also taking choir after school 4 extra credits.