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 Smile album re-recording vocals- how much? 

It doesn't say for sure in the article, and I'm not necessarily saying it should say in the article, but does anyone know how much re-recording of the lead and background vocals were done for the songs on Brian Wilson Presents SMiLe album?  I'm looking for this info and not finding it.  Did he re-record all the vocals or did he use some of the originals recorded by the Beach Boys in the 60s?  Specifically on the songs ""Good Vibrations"" or ""Heroes and Villians"".  Any help would be appreciated.  Thanks.   "