A rock musician may compose, arrange, and play music either alone or as part of a group. Additionally, they sing in record studios, on stage, and on television and in movies. Not all their work is performing for audiences. They also make records and CD's.
All musicians spend a lot of time practicing and rehearsing.
They sometimes perform in major cities around the world. This requires a lot of travel. They often perform at night and on weekends. All this can be tiring. Rock musicians work with a lot of different people.