In terms of chords and melody, She's My Collar feat Kali Uchis has complexity on par with the typical song, having near-average scores in Chord Complexity and Chord-Melody Tension and below-average scores in Melodic Complexity, Chord Progression Novelty and Chord-Bass Melody.
She's My Collar feat Kali Uchis is written in the key of B♭ Minor. According to the Theorytab database, it is the 11st most popular key among Minor keys and the 23rd most popular among all keys. Minor keys, along with major keys, are a common choice for popular music. The three most important chords, built off the 1st, 4th and 5th scale degrees are all minor chords (B♭ minor, E♭ minor, and F minor). See the B♭ Minor Cheat Sheet for popular chords, chord progressions, downloadable midi files and more!