For me its headphones unless I like what is playing in the shop (we have speakers in FAI connected to the shop speakers with our own volume control. I like hard rock/metal (Disturbed, Korn, Volbeat, Slipknot, ect...)
now this is some metal i can get behind. I've seen all of those bands live (more than once) except Fit for a king. And they're from east texas (couple hours east of me)