> "This is largely because MP3 is a crappy, old format. Try high-bitrate Opus on most samples and you're a lot less likely to get above-chance results on an ABX test, pretty much ever, at high bitrates."

I'll add to this that "high bitrate" for Opus can reasonably be considered as 128kbps or above, generally 160 or 192kbps are comfortably beyond what is needed to achieve audible transparency.

For anyone who's used to MP3 and just doing everything at -V0 or 320kbps, it's extremely impressive to hear how good Opus is, and how low bit rates you can get away with. Even at 24kbps it's serviceable for music, it sounds no worse than a slightly worn cassette tape.

It's a seriously impressive codec, both for speech and musical content.