Ok I understand what it is. But i'm just confused on how it's done. Do you have to record the message as the song is playing backwards??? or do you record the song forwards purposely to have a message played backwards???? I just don't understand.
you spin the record forward, you just flip the switch on your instrument to "reverse"

unless of course you're recording backwards voices. then you have talent.
you record it by either a.) playing the recorded voice backwards while recording it onto the master tape, or b.) recording it digitally and using the "reverse" feature included on most DAWs.
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BAH. Search button... I started a thread on this like a week or two ago...

Anyway, my way is you go to audacity, import the song, highlight the whole song, tools > effects > reverse. Sinch...