The Internet Oracle has pondered your question deeply.
Your question was:

> Great Oracle, who I'm sure has all of Hendrix's music, just answer me
> this one question:
> 
> Why are the Spice Girls so popular?

And in response, thus spake the Oracle:

} I am the Oracle. I code the uncodeable, kiss the unkissable, visualize the
} unvisualizeable, crash the uncrashable, boink the unboinkable. I can move
} mountains on a mere whimsy. The world's political leaders grovel before me.
} I know why people are born, why people die, and why so many of them insist
} on spending so much of the intervening time wearing digital watches. I am nice
} to small children and I know where my towel is.
} 
} However, I can't for the life of me figure out why those little twerps the
} Spice Girls are so popular.
} 
} Hmm...Lisa'a fifteen-year-old niece Alison is visiting. Maybe she can help me.
} H1!!!!1! MY N4M3 15 4L150N!!!1!! TH15 3-M41L TH1N5 15 50 K00L!!1!! 4NYH00, MY
} UNCL3 0RR13 45K3D M3 T0 3XPL4IN WHY M3 4ND MY FR13N5 L1K3 TH3 5P1C3 51RLZ
} S0 MUCH. W3LL, 1T'5 H4RD T0 S4Y. TH3 51RLZ 4R3 50 T0T4LLY K00L. W1TH LYR1X L1K3
} "1F Y0U W4NN4B3 MY L0V3R, YUV3 G0TT4 L34RN T0 D4NC3", TH3Y JUST C4PTUR3 TH3 
} H3ART AND S0UL 0F 4N 3NT1R3 G3N3R4T10N.
} 4L50, TH31R MU51C 15 G00D T0 M4K3 0UT T0.
} 
} Well, I think you have your answer. However, as answers tend to do, this one
} raises a whole host of other, less savory, questions.
} 
} You owe the Oracle proof that history doesn't repeat itself.