Bop! Goes the Weasel - Tommy Reilly (1952)

This is an example of a 78 where you can hear some blues harmonica (that's the chromatic one, as opposted to the diatonic instrument blues players call a 'harp').

I didn't think much of the A-side (which was a sameish blues by Sonny Terry), and began wondering why they'd put some other guy on the B-side, but the moment I heard Bop Goes the Weasel, my equilibrium was restored.