Music Roulette
When a person types a song they like into youtube and then after watching said song/ video they continue onto more music by using the suggestions area. They continue to select music until they have reached a song that is far from where they started. Sometimes a person may only wach a couple seconds of a video before moving on.
I started by watching a My Darkest Days video and two hours later I had music rouletted myself to Ace of Base.