Just a little experiment. I was curious, both about Melodyne and my voice, so I downloaded the free trial version of Melodyne, found a public domain song at pdmusic.org, sang it (well, one verse and the chorus), loaded it, clicked pitch correct, snap to Bb minor (the option that appeared), saved it, loaded it and the original into my DAW, panned one left and one right to see/hear the difference. The result is a kind of a flangeing close harmony thing.

The .zip contains the original unmelodyned files and variations.

The song is Ev’rybody’s Crazy ‘Bout the Doggone Blues But I’m Happy (1908) by Henry Creamer and Turner Layton

I’m not really sure about the bpm but that’s what my DAW auto-detected.