That's the finger he uses to play chords on guitar ... No pain was showing when Campbell, best known for such hits as "Rhinestone Cowboy" and "Southern Nights," turned back to his country ...

CharlieWorsham and I doing the great @GlenCampbellOfficial's 'Rhinestone Cowboy.'" McGraw takes the high lead vocal part for their impromptu cover, with Worsham strumming the chords on acoustic ...