Conversation so far:
What kind of sweaters did The Clancy Brothers make famous?
The Clancy Brothers' mother read news of the terrible ice and snow storms in New York City and sent Aran sweaters for her sons and Tommy Makem to keep them warm
What brought about The Clancy Brothers' success?
On 12 March 1961, 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 their apperance on the ed sullivan show?