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...)
Pretty much You tube in my ear buds. Nothing but metal / hard rock..... Black Label Society, Alice in Chains, Iron Maiden, Black Sabbath lately, A little Slayer mixed in....