It was the annual free summer pop party which brought the cream of the charts to a stage in Leeds.
Party in the Park was held every July in the grounds of Temple Newsam by Leeds City Council and Radio Aire and attended by more than 70,000 revellers.
Were you among the crowds at the concerts held between 2000 and 2004?
If so these photos from the YEP archive will bring back some happy memories.
WHAT ARE YOUR PARTY IN THE PARK MEMORIES? Email: email@example.com or Tweet him @AndyHutchYPN