It takes a few moments of fingering along with Kubo- more strings to work with means he can probably toss some chords in- but he follows the initial melody as is faithfully for a round or two when his turn comes to play. Just to make sure he's got the sound and meter down-

It's a different sort of sound, a different kind of key. A new pattern with new results; he picks in chords. "This is pretty sweet, Kid. You got any other songs you wanna hear? As long as you don't mind playing a little first I'd like to learn 'em."