Why not, Dick? I can be a retired senior teacher, a theatre critic, a former folk-music critic, a folksinger, a former goalkeeper for my school's 1st XI, a former Territorial Army officer... all at the same time. I bet you can be lots of things at once too. Who can't. The fact that one might be concentrating on one of these at any particular moment doesn't make the others vanish into the ewigkeit, surely? So Fred Jordan taking time off to sing other sorts of music from time to time didn't stop him being a traditional singer also.

~Michael~