Conversation so far:
Did the clark sisters make music?
They each began singing at an early age, and by the late 1960s.
Did they get any rewards or awards?
"You Brought The Sunshine", the album received a Grammy nomination.
Did they have any other albums?
the group released albums such as Unworthy, Count It All Joy, and He Gave Me Nothing to Lose.
Did they have any death in their family?
CANNOTANSWER.

Question: How many songs hit the billboard?
Self-contained rewrite: How many of the songs the clark sisters released hit the billboard?