Here's something I can't figure out.

I come home from a hard day's yakka at the coalface*, there's a 12 year old in residence, a ghetto blaster a-blastin' Gwen Stefani or the Black Eyed Peas from a bedroom, the TV in the lounge set to Nickelodeon, with the volume set to 11 (1 more than 10, see?), the stereo in the dining room blasting whichever artist isn't blasting from upstairs, the computer also in the dining room blasting an Eminem mp3 and on the couch is said 12 year old practising her guitar...

How does she do it?

* Not literally a coal face, that was an earlier life.