Chain Gang Of 1974 (Band who created the sleepwalking song used in Option B ending) will unfortunately not have any of their songs included in GTA 6.

Part of the GTA 6 news and leaks feed

https://preview.redd.it/hzg6p73mpcwh1.png?width=624&format=png&auto=webp&s=21e2da942dceb5c59285d9fe030710e887c4465d Very sad i wish they did!