How do you buy things on iTunes store?

you can use Limewire it is allegal and I dont recomend it because there is a high chance you will get a virus for your computer but if you DO choose to do this you find the songyou want save it drag it into iTunes then plug your iPod in and click synk library and there you have it you can download any song you want as long as your ok with there being a good chance of crashing your computer.