Perhaps someone with talent could give this a try.. I failed miserably but I think it has potential.. link
First verse is so-so, second is dreadful. Beyond that I didn't know what else to do so I gave up.
Hmmm, the songs aren't really in the same key and don't share a similar progression so it'd be hard to do much with it.
It's an interesting thought though.
Key? I know not of such technical mumbo-jumbo. Just make them fit better, someone.
LOL
Seriously, I don't know the basic fundamentals of music. I just edit stuff together and do a bit of crossfade when necessary to hide the edit.. and I suck at synchronizing.