According to Wikipedia:
"In 1985, an altered version was recorded for use in a TV advertising campaign for Toys 'R' Us. As Auty's voice had then broken, Blake recommended the Welsh chorister Aled Jones, whose recording reached number five in the UK pop charts, and who became a popular celebrity on the strength of his performance. The association of the song with Jones, combined with the fact that Auty was not credited on The Snowman, would lead to a common misbelief that Jones performed the song in the film. Walking in the Air has subsequently been covered by over forty artists, in a variety of styles."
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