Beeblyboop is a brand of an electronic keyboard.
In "Headhunters," Soos uses the keyboard to make sound effects during the grand reopening of the Wax Museum of Mystery.
The instrument returns in "Double Dipper," where Soos uses it while DJ-ing at the Party at the Mystery Shack.
In "Fixin' It with Soos: Cuckoo Clock," it is behind Soos, in his break room, when he displays the broken cuckoo clock.
In "Sock Opera," Candy plays the keyboard during "Who's That Girl" in Glove Story: A Sock Opera.
In "Blendin's Game," it is revealed that Soos has had his keyboard for ten years, receiving it as a present for his twelfth birthday from his grandmother.
Taking the appearance of a standard keyboard, it is dark gray with four legs, black and white keys, and the Beeblyboop logo in black letters on the front.