One of YouTube’s many attributes are the audio mash-ups that expose the source material for sampled music (take, for example, this outing of Daft Punk samples, or this collection of Dre breaks); long before guitarist Joe Satriani filed a lawsuit against Coldplay that accuses the band of plagiarizing his song “If I Could Fly” on their hit “Viva la Vida,” someone had already posted a revealing side-by-side comparison. If Joe could rule the world…