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.
These include people in the music business, such as other musicians and road crews. They have to deal with sponsors and backers. They rely on agents to find them jobs. They need people to market them. They also work with movie stars and other famous people.