Making mash-ups from full songs is very difficult and will almost never sound right. If you could get the moggs or (even better) actual multi-tracks for this the situation would be a lot better, but I don't think Cecilia is the kinda song that would end up on a Guitar Hero or Rock Band release .

As for the basic process: first you make sure that both songs follow the same tempo and root key (pitch), which shouldn't be too difficult in Audacity. Then, you usually pick a few measures of the basic rhythm track (why you need multi-tracks) and build your mash-up's song structure out of that. Where the verses are, where the chorusses (chori?) are, etc... then you overlay the vocal melody and the instruments of the songs to your liking over that structure et voila! A mash-up.

It's probably doable if you can get at least the vocal track for one of the two separate from the rest of the music, but for best result you need multi-tracks for both.

Belgium, which is probably best known for it's beer, chocolats and pedophiles... So yeah, maybe we're not to best example out there

By the way, if you like I'm more than willing to take a stab at mixing one of your songs for you; sound like a nice side-project!

The mix in that Sixx:AM example actually sounds awful to my ears. Especially the drums are horrid, and that typically _is_ the mix engineer's fault, although the recording engineer might have something to do with it as well (doubt it in this case though).

The AIC example sounds VERY good, conveying the band's typically dark sound and still sounding fresh and "'bright" enough... If you're looking at examples within the GNR/Slash realm, I've used IFOCS as a reference for mastering in the past as I really love the production on that album.

But I would suggest looking for very modern reference materials. As "classic" as your music might be, a modern production will make it sound more fresh. AFD was great for it's time, but if you make a heavy rock album produced like that today it's gonna fall flat on it's face.

Suggestions: Halestorm - I Get Off (but not their covers album), Maylene & the sons of Disaster - Step Up (I'm On It), Foo Fighters - White Limo & (best production evar!) Tool - The Pot.

Sure, count me in!