spotify:

1. Danceability, describing how suitable a track is for dancing based on a combination of musical elements, including tempo, rhythm stability, beat strength, and overall regularity.
2. Energy, representing "a perceptual measure of intensity and activity", based on the track's dynamic range, perceived loudness, timbre, onset rate, and general entropy.
3. Valence, describing "the musical positiveness of the track". Generally speaking, tracks with high valence sound more positive (e.g., happy, cheerful, euphoric), while songs with low valence sound more negative (e.g., sad, depressed, angry)

neural:

• intervals
• pitch
• timbre
• rhythm
• anger/sadness/happiness