[kregasaurusrex]

The compression codecs for OPUS are fantastic. Some users in a chatroom I frequent were trying to see how the sound held up at <10kbps, and the ranges were about on par with cassette quality for songs. My favorite one we tested was Ace of Spades - Motorhead, where it sounded almost identical for a 200kb size file versus the 9mb source. I know transcoding like this frowned upon, but it was a fun experiment.

[MrZeus]

Yeah, Opus is known to compress noisy rock/metal-like audio pretty well, even at low bitrates. The stuff it finds harder to do is tonal content, though it assigns more bitrate to help itself out. See the Tonality Estimation section here: https://xiph.org/~xiphmont/demo/opus/demo3.shtml