An example of Tony Rice:

http://www.youtube.com/watch?v=PXRJIsjmTg4

Ensemble Gurrufio in Venezuela (cuatro 2nd from right):

http://www.youtube.com/watch?v=4lGBNDtf-88&playnext=1&list=PLF44FDB08AF6C46DE

Some close-ups of the cuatro here. Cheo Hurtado really is a master:

http://www.youtube.com/watch?v=FIqunQrTaOg

One more example of cuatro, just insane what they make out of such a tiny instrument without much range. And yet, even in Venezuela, most people prefer glitzy singing stars with smoothed-up backing tracks or very restrained bands. They don't realize what they've got buried in the local culture (just like so many Americans don't appreciate the genius of Tony Rice).

http://www.youtube.com/watch?v=YlyKDWVUynw&feature=related