I personally quickly learned that the sound of the forge running, along with the constant ting, ting, ting of the metal on the anvil can almost drive you insane. So I listen to music while working.
What do the rest of you listen to while working in the forge? I myself am a fan of rock and heavy metal (no pun intended). I tend to listen to: Bring Me the Horizon, We Came As Romans and Breaking Benjamin. When I REALLY get in the headbanging mood, it is Amon Amarth, Slipknot, Lamb of God etc.