“ρ) Don’t use headphones
Using headphones is a very bad idea. Listening to loud music makes you lose concentration even if you think it doesn’t. If you can’t work in mute put some music but don’t turn your office into a party zone.”

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Mainframe.gr » 24 Freelancing tips (or the alphabet of a freelancer)

I can’t work without music - I guess it really depends on the music