✅ The BeOS file system, an OS geek retrospective
｢ One of BFS's most important and widely touted features is its support for extended attributes. An example of the importance of attributes is illustrated with an example of MP3 files. Information fields important to an MP3 file would be: song title, band, album, release date, encoding rate, length, number of times played ｣
https://arstechnica.com/information-technology/2018/07/the-beos-filesystem/