As a musician and long time band guy myself the humor was on point. Some of the puns and comedic references might go un-noticed if you're not a musician or familiar with the band lifestyle. But personally they were very enjoyable and on point.
But over all even without that, the movie was great. It had gore, humor, great acting, fun personalities and a pretty dope "cult classic" style horror vibe. All in all I loved this film. 10/10 for me.
If you're a music/horror lover you really need to watch this.