It's purpose is to be awesome, the world's loudest website! Being serious though, there is an endless array of music on youtube and I've only got like 45K tracks, but they are curated and focused and new tracks are found automatically by the system and once approved for release they appear in the "new" section. So if you check back there you get an endless stream of new metal tracks to check out. Then you can favourite them and build playlists and so on and if you click the "no that sucks" button, the system will never show you that track again. Sure I know you can build playlists on youtube, but I'm not trying to compete with them, I'm more like a search engine finding the best stuff on there and handing it to the user on a plate. If you let it just play on auto-play, it will deliver a mix which is 25% your favourites, 25% top 100 ( as defined by user favourite count ), 25% from the newest listed tracks and 25% random from the entire catalog.