This is an interesting, attention-grabbing riff. That octave jump and vibrato on the 4th-string G really makes a strong impression. I can hear this one creating a classic rock vibe, but more laid-back beat (reggae?) may also be interesting. Watch out for the Bb-D jump at the end of the turn-around. The block chords are C (G-C-E) and Bb (F-Bb-F).