This is the music theory video of Future "31 days" song produced by Zaytoven. The scale used is the D# (sharp) Phrygian mode (Major variant). That scale consist of the keys (D# ,E ,F#, G#, A#, B, C#). The mood(feeling) is jazzy, exotic, latin, positive, or mysterious. Chord progession is D# sus4(sus means suspended not suspect!!), Emaj7b, C#Maj, and Bmaj13. Check out the original song https://www.youtube.com/watch?v=rcTIq5mtRRM