Conversation so far:
What is the current line up with the Brotherhood of Man?
In 1972 he got together a trio of session singers, Martin Lee, Nicky Stevens and Lee Sheriden.
How long did this current line up last?
CANNOTANSWER.

Question: What did the trio of session singers do?
Self-contained rewrite: What did the trio of session singers, Martin Lee, Nicky Stevens and Lee Sheriden do?