How do you persuade your parents to get you Guitar Hero?

Tell them the facts:

It's a great game.

It involves a lot of skill with finger movement and hand-eye coordination, skill that can be practised or obtained.

It takes a long time to get bored of, so it's not a waste of money.

It's not a typical violent game.

It's bringing back the oldies, so even your parents can enjoy it.

And your parents can play it, too.