Only if their music is taken up by the community and undergoes the folk process, or are you now seeking to re-define 'tradition' too?.

There is a Tradition of Composition for Northumbrian Smallpipes; this is readily accepted a being Traditional Music. Look again at the remit for the ICTM (formerly the IFMC - who came up with 1954 Definition in the first place): to further the study, practice, documentation, preservation and dissemination of traditional music, including folk, popular, classical and urban music, and dance of all countries.

As a certain Jim Carroll said in his post of 13 Apr 09 - 03:17 AM: Some of us 'patonising folklorists' annd researchers have been screaming our message about the creative abilities of our source singers from the rooftops for the greater parts of our lives, largely to deaf ears.