The episode where the Scoobies are shocked because Giles is singing is "Where the Wild Things Are" (Season 4, Episode 18). The cafe is called Espresso Pump.
Spike doesn't exactly take the Scoobies anywhere, but he is talking to them just before the Scoobies decide to go find Giles.
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Spike doesn't exactly take the Scoobies anywhere, but he is talking to them just before the Scoobies decide to go find Giles.