Go to an online music mix website. One site in particular is Last FM (See References.)
Create an account. Click "Join" at the top-right corner of the screen. Enter your user information and click "Sign up and create my profile."
Create a playlist. Click your username on the top-right corner of the screen. Click "Library" and select the "Playlists" tab. Click "Make a new playlist." Create a playlist name by clicking on the "Untitled Playlist" text. Add a description and click "Upload Image" to insert a playlist cover. Click "OK" to save.
Search for songs. Type the name of the song or artist into the "Music Search" bar and press "Enter." 'As I Lay Dying', 'Job For a Cowboy', 'Norma Jean' and 'Reign of Osiris' are all heavy metal bands worth listening to.
Add tracks to your playlist. Select an album by the artist and highlight the track name. Click the down arrow and choose "Add to Playlist" under the drop-down menu. Select your playlist and click "Add to Playlist." Go to your playlist and click the track name to play the song.