Chord progression in the key of Ab.
The chords are: Cmin (iii), Cmin (iii), Dbdom7 (IV), Cmin (iii)
The video is a still image of a music staff with the chord notes
and guitar chord diagrams.
The audio was generated using the MMA: Musical MIDI Accompaniment
"CountryBlues1" groove at 130 beats per minute.