And a brilliant example of campanella playing:

Boureé from Partita No. 3, BWV 1006 by J.S. Bach, played by John King:
http://www.youtube.com/watch?v=WAgMqbsKhgw

"Campanella" means "bell-like". It's also spelled "campanela", and that may be the more proper spelling. This style of playing is nothing new; one of the reasons reentrant tunings developed in the first place was to facilitate sustain through this style. So the ukulele is coming back full circle.