For general browsing I like a noise to accompany me, either videos or music. When I have something critical where I need to focus I turn it off or I turn on classical music, stimulates the brain a bit more 😀
Depends really, I like to be silent with no music or radio in the car 😉 but when doing ETS I have to have music on 😛 Most of the time I only put it on when on my PC and that's not that often