ALLENTOWN, Pa. - It was a big day for record stores, jazz lovers, and Allentonians alike.

A recording of Louis Armstrong performing at Muhlenberg College has resurfaced and is now on vinyl, just in time for Record Store Day.

I found my thrill on Blueberry Hill. It's one of Louis Armstrong's greatest hits.

But decades later, the recording is thrilling people for another reason.

Louis Armstrong and His All Stars Live in 1956 was recorded at Muhlenberg College, but wasn't discovered until just recently.

Jamie Holmes, owner of Double Decker Records in Allentown, says 2,500 limited edition copies were released as part of National Record Store Day.

"We've had a lot of calls from people who were there originally or their parents were there or the grandparents were there," Holmes said.

Armstrong performed in Allentown five times. And at the time of the recording, Satchmo was preparing for a very auspicious occasion.

Local historian Fran Whelan says 3,700 people attended the concert, held to raise money for the Police Athletic League.

Collectors say the sound quality has withstood the test of time and captures Armstrong's interactions with the audience between songs.

Collectors say it's no wonder it sold out in a matter of hours.