The very concept is evil, so I don't know whether to be appalled, or admiring of the technique displayed in Stayin' Alive In The Wall (Pink Floyd vs Bee Gees Mashup) by Wax Audio. Pink Floyd admirers watch at your own risk:
Oh no, there's more where that came from.
Wow.
Like other amazing mashups, this one works because it plays off something common in their ancestral musical DNA. This is why I find most rap/rock mashups boring; it’s too easy, and doesn’t depend on something truly unique to the pairing. But see Jaydiohead.