Neutral to ground voltage

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Moderator Post (s) for this thread: > Floating ground. by Billhart on 10/29/2007 > Multiwire ciruit by Billhart on 10/29/2007 > Grounding and bonding by Billhart on 10/29/2007 > Grounding and bonding by Billhart on 10/31/2007

Hello I just bought a new house and noticed when playing my guitar, I have a terrible buzz coming from my dimmer lights through the amp. Of course the outlet wasn't a 3 prong grounded, so I put in a GFCI and when I was done there was 50 volts hot to ground and 47 volts neutral to ground, 120 between neutral and ground. I checked the rest of the outlets on this circuit and they are the same. Whats going on? I haven't opened the rest of the outlets up, but I can tell you they are on the same circuit as the dimmer lights. Neutral and grounds are connected to same bus bar in breaker box, I plan on changed to seperate bars. The outlets appear to be daisy chained together, would a break in the ground wire do this?