They rely on agents to find them jobs. They need people to market them. They also work with movie stars and other famous people. Rock musicians most often work indoors, but some may perform in outdoor concerts. The many hot lights used on stage can be uncomfortable.
Rock music is very loud and causes hearing loss.
There can be danger from fans who become excited. Also, rock stars may be around people who use drugs. Because many musicians find only part-time work or are unemployed between performances, they often work other jobs while waiting for their next performance. The life of a rock musician is not a quiet one. Many jobs are in New York, Los Angeles, or Nashville.