I just spent $16,69 (13 euros) on the following:

1GB memory card
MP3 player
Portable speaker
Cable for mp3 player «> speaker

"That must sound like spoon!"
Indeed, but that doesn't matter, because here's my plan:

I'm going to put some elevator muzak on the memory card and plug it into the mp3 player. I will then put the mp3 player on repeat as it remains connected to the power at all times. I'll then run a cable through an existing hole to the portable speaker, inside my bathroom, and connect it's power to the light switch.

Is that awesome or what?