Terrible joke

Billy, The world expert on European wasps and the sounds that they make, is taking a stroll down his local high street. As he passes by the record shop, a sign catches his eye.
"Just Released - New LP - Wasps of the World & the sounds that they make - available now"

Unable to resist the temptation, Billy goes into the shop.

"I am the world expert on European wasps and the sounds that they make. I'd very much like to listen to the new LP you have advertised in the window."
"Certainly, Sir," says the young man behind the counter. "If you'd like to step into the booth and put on the headphones, I'll put the LP on for you."

Billy, The world expert on European wasps, goes into the booth and puts on the earphones. Ten minutes later, he comes out of the booth and announces,
"I am the world expert on European wasps and the sounds that they make and yet I recognised none of those."
"I'm sorry Sir", says the young assistant. "If you'd care to step into the booth, I can let you have another 10 minutes."

Billy, The world expert on European wasps and the sounds that they make, steps back into the booth and replaces the headphones. Ten minutes later, he comes out of the booth shaking his head.
"I don't understand it", he says, "I am the world expert on European wasps and the sounds that they make, and yet I still can't recognise any of those!"
"I really am terribly sorry", says the young assistant.............
{click and drag the line below to read the punch line, - you were warned, it's bad...}
......."I've just realised I was playing you the bee side."