Data fields embedded in an audio file (title, artist, BPM, key, genre, artwork) that DJ software reads to populate, search, and filter your library.
ID3 tags are structured metadata fields stored inside an audio file that carry information such as title, artist, album, BPM, musical key, genre, and artwork. DJ software reads these fields to build and search the library without scanning filenames.
Why it matters
Clean, consistent tags are what let you filter by key, sort by BPM, or pull a genre crate instantly under pressure. Missing or incorrect BPM and key tags break harmonic mixing workflows at the point when you need them most.
In practice
Standardize tags before files enter your library: use one tagger (or your DJ software's built-in analyzer) to write BPM and key, then lock the values so future imports do not overwrite them.
