I dont see Shazam in the App Store Mexico, is there a way to install it?
-- UPDATE --
Ok i have figured out how to do it, just register a USA account in iTunes with this tutorial:
winandmac.com then logout your normal account and log in with the USA account, search for Shazam in iTunes and download, then logout the USA account and login with your normal account and finally sync your iPhone, Shazam should be there in your iPhone.
I think this method should work with all the missing apps for your country.
-- UPDATE 2 --
Ok, it works but all your apps from your country store will not work if this app is installed, so i think is not a valid method.