I read an interview with Daniel Lanois, and he said the original version 'Walk On' is much more organic, and I believe he said it was acoustic. It very nearly didn't make the album, but Bono was so in love with the song, that -- according to Daniel -- they "bolted a version together to fit on the album." I can't believe Daniel Lanois didn't want it on the album! The guy must be insane...
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The Tempest