Tanywheelers mystery musician sounds a lot like Brian MacNiel. I know he has performed in Texas. He comes on stage starts a hand clap over his head sings "Join the Union" 75 times with versey bits inbetween, the audience are his, brilliant performer. Spent 25 years with the Battlefield Band and is Head of Scottish Studies at Edinburgh (I think) University, so I guess he paid his dues too.
It is a great union song but I don't know the words either.
JohnB