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"Supergirl" by Crystal (I think)
Searching Kazaa, I found two songs named 'Supergirl': One by Krystal and one by Reamonn.

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Mariah Carey - Hero
There are also two Spanish versions of this song, one by Mariah Carey and one by Natalia.

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Here are some that say something about heroes in general:
How about ABBA's 'Super Trouper'? peep

I found more songs, but they have all already been mentioned.
AnnaBtG.

What we've got here is failure to communicate...