Besides singers, musicians and musicians, what other occupations are related to rock music?

If you learn well, you will become a musician, such as pianist, singer, then music educator, music teacher, then musician, composer, lyricist, arranger and so on. Most of them can only perform, do band performances, big bands join song and dance troupes, small bands enter karaoke bars, and go to bars, cafes, teahouses or hotel lobbies alone!