dirty version would be a bad acealpla in which you can hear the music, in that case, that would mean the actual song.Alcapella is just a music term for, basically, just the vocals.By clean, they mean you mostly hear clean vocals (albeit some distortion), without hearing the actual music.It is editing after all.This is pretty good.
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Katy Perry at The People's Choice Awards in Hollywood, California. (January 5, 2011)