Playing around with a ukulele I've come up with a strange one that actually works pretty well.

I've strung one with old guitar strings to give me a fiddle/mandolin type tuning, GDAE, but I was never really satisfied with the sound, though it's fun to play. The high E never sounded right, because it really needed a thinner string.

But then I tried retuning a uke with standard strings, GCEA. Fourth strings stays the same but of course an octave high), third goes up to D, second goes up to A, which it didn't seem to mind. But putting the first up to E was a bit much - so I tried tuning down instead. Which doesn't sound as if it would sound good at all, but it did.

Try it, and see if you agree, especially playing in G.

The low first string gives it a feeling I really like. I've never cone across anyone using that - though I believe that traditionally the cuatro used to be tuned using a low first string.

I think it counts as a reentrant tuning. Or in this case a double reentrant tuning, since the fourth string on a uke already involves one.