And while the idea of mash-ups has been popular ever since, very few albums in that style have found their way to any kind of prominence (probably because most attempts to mix one artists vocal stylings with another's music ranges from the crappy to the downright laughable).
Or at least it seemed that way until The Silence Xperiment came up with Q-Unit -- which mixes the arena rock stylings of Queen with thug rhymes from 50 Cent.
It takes some getting used to and it's definitely not for everyone, but it's a combination that seems to work better than most. Best of all, everything's available free for download from the site for you to check out to your hearts content.
(Mad love to the Monster for the link)