Like fermenting must.
I pressed out 7.5 gallons from 70# pears 9-24-14, balling = 8, acid = 0.2. Raised balling to 24 and added acid blend. Used EC1118 yeast. there is now about 6 gallons, alcohol = 12% and acid = 1%
Let me say that pear CAN smell somewhat musty if you've never made it before. I think I know what you're talking about there and it's totally normal. If the fruit was good, with no mold on it especially if you froze them first and allowed them to thaw, then there is no reason for it to TRULY be a mold condition.
Any chance the stopper or outside of the carboy neck is stinky, and not the wine? Those rubber stoppers can hold oders sometimes. It make the top glass of wine "taste" funny. Holding ones breath when drinking eliminates the bad "taste", smell really.