"We're Gonna Have a Party Tonight" is a song that was featured on the Worlds of Wonder series' own World of Snoopy books with the Talking Snoopy plush. It is also featured in the opening of the documentary, "You Don't Look 40, Charlie Brown". Parts of the animation and music from this documentary were later used in the opening sequence of It's Your 50th Christmas, Charlie Brown. In Snoopy's Birthday Party, Snoopy sings about preparing his birthday party with the children.