I have been learning to pick out tunes on the ukulele, and the first one I learned was a ragtime tune called Dimples, written by L. E. Colburn. (Scroll down the page to find it.)
I bought two books a few years ago, called Ragtime Rediscoveries, and Ragtime Rarities. and there are some really good tunes in them. That's where I found the Dimples tune. All of the tunes in the two books are on that site.
I decided to buy a uke and try to play it. I have also been trying to learn some of our usual tunes from the regular folk session group. There are other people in our session group who also have one and every now and then we have a ukulele session and it is heaps of fun. A lot of "serious" musicians in the folk scene look down on ukes, but it is a growing movement and it is folk at its best because more and more "non musicians" are discovering how much fun it is to play music, and to be in some sort of musical/social group. There are a huge number of uke classes around here, too, and one of the local uke groups travels around the country and the world to perform.
I think that any instrument played by Groucho Marx OR Harpo Marx is good enough for me. A uke is a lot easier to carry than my harp. (Yay for the Marx Brothers!!)