Conversation so far:
What kind of sweaters did The Clancy Brothers make famous?
Aran sweaters.
What was their first popular song?
Brennan on the Moor", "Jug of Punch", "Reilly's Daughter", "Finnegan's Wake", "Haul Away Joe", "Roddy McCorley", "Portlairge" and "The Moonshiner".
What brought about their success?
the Clancy Brothers and Tommy Makem performed for around fifteen minutes in front of a television audience of forty million people for the first time on The Ed Sullivan Show.

Question: What else helped in their success?
Self-contained rewrite: What else helped in The Clancy Brothers success besides a performance on The Ed Sullivan Show?