Which is the best site for legal music downloads?

[Yurtgirl]

I am utterly ignorant of the answer and would love to be enlightened if you wouldnt mind!

Legal download sites only though please

Best in what sense ?

Cheapest ?
Widest selection ?
Ease of navigation ?

Oh um - didnt think of that!

Ok um overall which has the widest selection with the easiest navigation and also happens to be inexpensive!