I finally made a short video of my other ukulele-family instrument, a 10-string "tiple." I'd like to think it was by popular request... usually phrased as "What the hell is that thing?"
The Martin guitar company made tiples for 30 years or more, but I see no immediate threat of a revival in tiple playing... although something inspired the Ohana ukulele company to produce this version. In Colombia there is a larger instrument by the same name, with some marvelous players. YouTube will find you examples of both.
I bookmark what I find about the instrument here: delicious.com/bstepno/tiple
The tuning is similar to a uke (or a guitar capoed at the fifth fret), but in four courses --
Gg-cCc-eEe-aa -- with the big letters indicating strings tuned an octave lower than the ones they are paired or tripled up with.
The second tune I play is one of my favorites ,"I wish I could shimmy like my sister Kate," using a chord progression folks of a certain age will recognize as being pretty similar to Country Joe MacDonald's "Feel like I'm fixin' to die rag."