www.CostaRicaTicas.com

Not many these days and with changed roles. The old skool is best exemplified by this gent--hang on, it's rollicking: http://www.youtube.com/watch?v=E4Tw70fbKHM
The new gen sounds like this (that's his real name, as far as I know)--not front-and-center but a harmonic sweetener (nice solo, though): http://www.youtube.com/watch?v=Dr1Luw-Y-9M

BONUS: In looking up Mr. Iguana, I came across this. Just have to share:
http://www.youtube.com/watch?v=yNrOZ9j2GbE

If you don't know about this site, Brothers and others...well, you need to: http://www.chicagobluesalivinghistory.com/usa/

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"A man accustomed to hear only the echo of his own sentiments, soon bars all the common avenues of delight, and has no part in the general gratification of mankind"--Dr. Johnson
"Amen, brother"-ED