Try
simply noise! Works great for drowning out your auditory environment.
As for whether it breaks a precept... I think you have to take a look at the point of the precepts in the first place. What's the goal of that precept? According to
access to insight:
Access to Insight:
...and an additional three precepts [which include "I undertake the precept to refrain from dancing, singing, music, going to see entertainments, wearing garlands, using perfumes, and beautifying the body with cosmetics."] that are especially supportive to meditation practice.
So as long as whatever entertainment might assault your senses doesn't distract you from that purpose, you'll be doing it in the right spirit. But one could hold the precept to the letter and yet not have that give them any benefit if their intent is not properly applied. (e.g. you can sit there with eyes closed, earplugs on, and just think about random things for the whole day. wouldn't really benefit anyone.)