What BPM/key analysis means
BPM and key help DJs filter and prepare crates, but they still need human checking.
BPM is the approximate tempo of a track, while key is its musical key or Camelot value. These fields help find compatible tracks, build warm-up and peak-time crates, and prepare a set faster. In DJ Crate, values come from shared audio analysis, but you can save a personal correction. Your own value appears first in your library.
Automatic analysis is not absolute truth. Algorithms can be wrong on beatless intros, live drums, broken rhythms, half-time, or double-time material. A 124 BPM house track can occasionally appear as 62 or 248 BPM if the detector locks onto the wrong grid. Key detection can also be uncertain when a track modulates, contains noisy samples, or only has a short preview.
Use BPM/key as a practical hint, not as a replacement for listening. Before an important set, verify key transitions in headphones or DJ software. If a value is clearly wrong, save a personal correction on the release card. It changes your library and labels but does not rewrite shared analysis for other users.
When a track has no preview, analysis may be missing. Some releases only have external or short shared excerpts. In that case use "Find preview" on the release card, or explicitly consent and upload your own audio file: the source stays private while a processed short excerpt may become a shared preview.