On Saturday night after a campaign stop in Youngstown, Ohio, Kaine and Clinton shared some pizza.
Then Kaine and his wife joined staff members on a separate bus to continue the late-night ride to Cleveland. During that trip early Sunday morning, Kaine broke out his harmonica. He previously told CNN that he was packing six harmonicas for the bus trip.
Kaine is an admitted music lover. Friends have described him as being able to talk about any genre of music. He's reportedly played on stage with such musicians as Boyd Tinsley, Bruce Hornsby, Ricky Skaggs, Dan Tyminski and the Cary Street Ramblers.
Even before this campaign swing, the vice presidential candidate had shown his musical chops: Last Sunday -- days after he was named as Clinton's running mate -- he sang a solo in his church's choir.
Kaine has for years been a tenor in the choir at St. Elizabeth Catholic Church in Richmond, though he has admitted his political career has made it hard to make practices.
So far Kaine hasn't responded to the challenge.