"So would a singer from the travelling community be considered traditional? "
David - don't understand the question
Travellers continued to have a living song tradition right into the mid 1970s and kept alive many songs - particularly ballads - long after the settled communities had abandoned them - in the case of ballads, sometimes centuries longer.
More than any other tradition, theirs was an almost totally an oral one.
Why shouldn't they be considered traditional?
Or are you aiming your question at Arthur itus's idiocy?
Jim Carroll