Which model makes the songs, and what’s its license?
ChorusPop uses YuE2-3B by M-A-P, licensed CC BY-NC 4.0. That license doesn’t allow commercial use, so ChorusPop is free and non-commercial. Read the license before using songs commercially.
Attribution is also in the app under Settings ▸ License.
Mac: Attribution is also in the app under Settings ▸ About.