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...)
I typically listen to disturbed, avenged sevenfold, FFDP, Godsmack (and many similar others). Don't know if anyone has brought this up yet but I have been listening to a lot of Black Top Mojo. I just recently discovered their existence and I really enjoy them. Also, Fame on Fire. They do a lot of covers to common songs that I really enjoy.
I typically listen to disturbed, avenged sevenfold, FFDP, Godsmack (and many similar others). Don't know if anyone has brought this up yet but I have been listening to a lot of Black Top Mojo. I just recently discovered their existence and I really enjoy them. Also, Fame on Fire. They do a lot of covers to common songs that I really enjoy.