Use both class options at least twice before trying to age up. You can also use anySocial Mediaplatform to display your skills and make fans from a young age. But, it won’t add anything to your journey until you become too famous. Practice and improve both the prescribed skills till you graduate from high school.
Related:How to become a K-Pop Singer in BitLife

After reaching 18 years of age and graduating from high school, the Job section will be open for you. Now, browse the tab and look for any career with the Musician tag. The job offer can either be for a solo artist or an instrument player for any band. Take up any listing that suits your interest, and you will become a musician.
Remember, it is hard to get selected for any Musician job. So, keep honing your skill each year and apply for any job that appears repeatedly.
For more onBitLife, check outHow to become a Pop Star or Famous Singer in BitLifeorHow to take voice lessons and increase voice skill in BitLifeon Pro Game Guides.