The classic guitar line by Andy Summers apparently they were struggling with this song in the studio and about to give up until Andy went for it!
Chord Progression: I-vi-ii-IV (G-Em-Am-C)
Structure: ABABCB (Verse-Chorus-Verse-Chorus-Bridge-Chorus)
Melody: Simple, hypnotic vocal phrasing paired with an arpeggiated guitar riff