My old computer died on me with no warning signs. I didn't know or need to copy my music to another computer. I would like to know how to get the music that I bought onto my new computer without having to buy it all again.

My old computer died on me with no warning signs. I didn't know or need to copy my music to another computer. I would like to know how to get the music that I bought onto my new computer without having to buy it all again. I just want to be able to get all of my music that I bought on itunes onto my computer. Right now the money ive spent is just gone and I have no music to show for it.