Classical guitarist Gregory Alliston had two songs on one of the Radio Canada compilations I bought at a CBC sale, but unfortunately the liner notes didn't include any biographical information. So, beyond a couple of fleeting references on the internet, I have no information about Mr. Alliston. Seems like he was/is a pretty good guitarist, though. Both pieces are, as stated above, in a classical style; "Mam Ha Decarnaval" is slower and somewhat reflective, while "Samba de Orfeu" is more upbeat and lighthearted, what with the slide whistle kicking it off and all.

Mam Ha Decarnival
Samba de Orfeu