Mine is Artist name - Song name [(Version)] (Year)[(Bitrate)]
Version is optional. It’s stuff like Radio edit, remastered, extended, etc.
Bitrate is optional as I switched to FLAC and rarely need to use MP3.
The worst one I have is something from Beatles in 32kbps HE-AAC at 22.5kHz SR with name written in Chinese. It is one of the oldest files I have.