This indicates the song is in the key of B Major (or its relative minor, G# Minor). DJs use this code to identify tracks that will blend harmonically without clashing.
This indicates a tempo of 122 beats per minute , typically associated with house music or mid-tempo dance tracks. 3b (122).mp4
This specific file naming convention is common in curated playlists or "music pools" used by professional DJs. This indicates the song is in the key