What are some free download music sites?
That would have heavy metal.
Jamendo is the best website to download free music. There is a wide range of music by different artists and in genres. The music is free and legal under the Creative Commons license. You can also download music from CC Hits and Amie Street.
I use vid2mp3, you just have to get the URL from the song that you want on YouTube and copy and paste it to the site.