Audio Features
Speechiness
How speechy/wordy is the track? "The more exclusively speech-like the
recording (e.g. talk show, audio book, poetry), the closer to 1.0 the
attribute value" (Spotify Documentation)
Mode
Major (1) vs. minor (0) scale; major keys feel more positive than
minor keys.
Valence
Measured 0 to 1; "Describing the musical positiveness conveyed by a
track." High valence is more cheerful, low valence is more depressed.
(Spotify Documentation)
Instrumentalness
Measured 0 to 1; Does the track have vocals?
Energy
Measured 0 to 1; How energetic is the track? "Perceptual measure of
intensity and activity" (Spotify Documentation)
Danceability
Measured 0 (least danceable) to 1 (most danceable); How danceable is
the track? "Based on a combination of musical elements including
tempo, rhythm stability, beat strength, and overall regularity"
(Spotify Documentation)
Acousticness
0 to 1; How acoustic is the track?