From SoulTracks.com-

A prolific musical genius who has created a “Mt. Rushmore” career, Stevie Wonder was just a kid when he was signed by Motown, a talent too good to pass up, even if the Motown brass didn’t really know how to market him. Those doubts came to a halt on August 24, 1963, when an unlikely B-Side release became a record-breaking hit for the 12 year old star.
“Fingertips Part 2” was a live recording that showed the young performer at his loosest and best, playing with the audience and improvising onstage in the latter half of a song. It was a surprise radio pick up, and an even bigger surprise as it rocketed all the way to number one.

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Today in Music History: A pre-teen Stevie Wonder breaks all the records - SoulTracks