Joe Brown was a big name in the UK during the 60's and is a multi instrumentalist and though he must be in his 70's (at least) he is continuing to perform and tour.
I was watching a TV show recently and he was on playing a uke and saying how he has recorded a new CD using (mainly) a uke and double bass. He said he sings a few "rock" tunes as well as some standards. So if your into the uke, maybe you'd like to give this a listen. I cant give you the link as I have not looked it up myself yet.