You're just referring to scene releases for music right? It's a bit confusing since you're referring to bundles, scene releases can be on their own or in a bundle depending where you get them. Private torrent trackers with scene releases for music have that type of thing e.g. some scene trackers do a 0day bundle of music every 1-2 weeks, some scene trackers do individual torrents of those releases.

I don't download much music so it's not something I'm well versed in but know it exists. Seems sort of annoying downloading a whole bundle of random music releases when you only care about 1-2 of the releases in the bundle. Then again having individual torrents for each and every music release does tend to lead to lots of dead unseeded torrents later on.

Interestingly public torrent indexers tend to have other non-scene groups doing music releases. On the FLAC side of things I've seen EICHBAUM and PMEDIA show up a lot and I'm pretty sure those have nothing to do with scene.