When the curtain opened at the Apollo all you heard was ......crickets.

I noticed when they sing Oh Boy when he says You were ment for me a woman in the crowd sings it too if it is the first time she hears it from Buddy Holly how does she know the words

Good observation. She would never have heard the song before. Just read how Ed Sullivan thought the song too raunchy so they only got to sing the one song. On their first appearance they sang Maybe Baby only.

Gutsy move to open with a song called "oh boy" given their audience!