The second bot comes equipped with a microphone, into which one can rap, sing or make beat-box noises and, with a push of a button, the passage will repeat on a loop.
The third bot, the "hands bot," has eight different sounds, which are activated when someone puts on a foil bracelet and touches one of the metal hands with the bracelet wearer's body completing an electrical circuit.
"Isn't it awesome?" gushed Rowan Stigner, one of Spy Hop's robot builders. "It's every different type of audio experience."
The beat bots are situated near the Make Salt Lake tents, near The Leonardo on Library Square, and reflect the software-meets-hardware DIY attitude of the Maker movement.
Adam Sherlock, Spy Hop's community program manager, said young people are familiar with the tools of the Maker movement, and seeing the technology melded with handmade robots "tinfoil and tape and a lot of junk," as he put it gets their curiosity going.
"They get into critical thinking and say, 'Show me how it works,'" Sherlock said. "In our childhood, it was enough to play a video game. Now, they're so empowered to hack into things … and go, 'Do what I want it to do.'"