Boodle Am Shake was written by Jack Palmer and Spencer Williams in 1926 and has been covered by a number of people since including John Fahey and The Grateful Dead. Lil Rev recently put up a ukulele version that works really well for ukulelists looking to get more familiar with chords further up the neck.
It’s well worth taking a note of the different chord inversions that crop up in the tune: the C7 played at the fifth fret (at the beginning) and the 1st position (at the end of the verse); and the G7 played open and at the 7th fret. When you’re chord soloing, you can create something much more interesting with these variations to hand.
In the instrumental section, he substitutes this descending part for the chords: