Machinations mesmerize in this video of a robotic xylophone, marimba and glockenspiel playing "Flight of the Bumblebee" by Nikolai Rimsky-Korsakov. The robots have names: MarimBot, XyloBot and GlockenBot. Their creator is Eric Singer, who is developing this robot group for a show in a Paris nightclub. What fun! -Via Laughing Squid
And as the video page says, it's a marimba, xylophone, and glockenspiel. A marimba is quite a bit larger with big wooden keys that make a deeper and more "tropical" sound. While a xylophone has smaller fiberglass keys that make a sharper sound a bit like glass bottles.
The vibraphone is the only one in the family left out, being in-between those two in size, having metal keys and a sustain pedal for long dream-like notes.
* https://www.youtube.com/watch?v=qYtrnr4chfU (Marimba)
* https://www.youtube.com/watch?v=BHP5xjBP-9I (Xylophone)
* https://www.youtube.com/watch?v=0vf-gTakrp0 (Vibraphone)
And this one is just simply hilarious:
* https://www.youtube.com/watch?v=JurYqQBQkEI