In general, I think mashups are a bit overrated.
This one called "Hip To Be The Sandman" combines James Hetfield's vocals from the Metallica mega-hit Enter Sandman with Huey Lewis And The News' Hip To Be Square.
In this particular case, the vocals sound pitched up to fit the song. So even though Metallica is my favorite band EVER and I like Huey Lewis & The News, I'm not feeling this one. But it's interesting.
To me, the greatest, most unexpected mashup ever is the one below with RATT's Round And Round and Marvin Gaye singing Heard It Through The Grapevine.
Here's the RATT/Marvin Gaye mashup...
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