The Incredibles is the name of more than one artist.

1) a mid 1960s soul group from Los Angeles. Members were were Cal Waymon, Carl Gilbert, Alda Denise Edwards and Jean Smith.

2) a house group consisting of Gregory Cocco, Peter Hantke and Stefan Heinemann.

It may also be an incorrect artist tag for the soundtrack by Michael Giacchino.
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Artist biography from last.fm