Campanitas - Mis Llamitas

I finally managed to get ahold of one of the most spectacular guitar-like instrument pieces I've ever heard. This is, I believe, a Charango and a Tiple, but I can't say for sure.
http://theoldquarter.dyndns.org/files/campanitas.mp3
If you like it, you should buy the whole Inti Illimani album because it's awesome. It's called Imaginacion. But yeah, that is one great piece. The other amazing piece with cool cuatro playing this time is Illapu's Golpe Tucuyano. I envy them... :)