Some features are disabled in mute-mode to make sure you will not accidently save, download or comment on a different jamtrack from the one you are currently hearing. You may either lift the mute-mode to download or interact with the currently displayed remix, or move to the currently playing track with the green GOTO button.
The "Chorus" is repeatedly G Bb G Bb G Bb G G Bb G Bb G Bb G
Please note that there is a slight difference between the "Caug" Chord played by the Keys and the guitar rhythm, and also the A chords - but that should not be a problem, I will discuss this later with the key player - I like the slightly odd sound :).
Anyway I am pretty crap with notes and chords, your ear will be better at finding out the chords/notes for sure!