The visa foreign performers actually need to work in Indonesia, even for a single ticketed appearance. Indonesian immigration treats any paid or ticketed performance as work, which is why touring artists get deported off tourist visas more often than any other category. C7A is for the performer themselves; C7B covers the touring crew supporting them, including tour managers, sound engineers, lighting, and stage staff.
Foreign DJs, musicians, and performers with booked Indonesian appearances
Tour managers, sound engineers, and technical crew accompanying a performer
Foreign acts on festival billings, private events, or promoter-sponsored tours