If you want a challenge on fiddle try The Acrobat's Hornpipe in Bb, not necessarily too hard and certainly not that fast, but it needs good clean intonation on the chromatic runs. I posted the tune a few months back.

If you're a double bass player you can always pivot it around on its stick - as long as you remember that you have a bug attached. Audiences almost demand it on a 50's number.

Have fun, John