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The "xylo" is greek for wood
(slrpnk.net)
A lone figure at a party reflects that the rest of the revelers don't know that "xylophones" with metal bars are actually glockenspiels.
German Glocke = English bell = made out of metal
Literally Glockenspiel = bell game
Chiming in for clarification: Literally it's "bell game" but the word's meaning is more like "bells that play" or "bells to play with".
Oh yah, play with mein bells
Aw man I just spieled on mein glock
And this is why it is good advice not to think too much about that word as a German speaker.