I could see Google adding a "music:" search and results page similar to their movie: [google.com] search now. Just like it made sense for them to partner with the premier movie database owner (IMDb), it makes sense for them to partner with the premier music database owner (Apple).
If Google includes album artwork, easy links to the audio samples, and ties in lyric searching -- I might just look for songs on Google before buying them at the iTunes music store. The iTMS search function sucks right now anyways. :/
Who's gonna be upset? Hmm... probably the bazillion lyric website owners out there that Google would have to scrape to build a comprehensive lyric search. Other than them, Apple and Google both win and their respective users both win as each gets new useful features.
Daring Fireball [daringfireball.net] noticed a redirect oddity on google.com:
For example, as of this writing, if you go to [google.com...] you’ll get redirected a few times and land at an AdWords marketing page; whereas [google.com...] generally results in a 404 (“Not Found”) error...
Why does Google have that redirect on their server unless they are going to be sending traffic to the iTunes music store or publishing iTunes partnered search results?
In my experience, all the different pieces of a complex new service get pushed online with the 'public front page' being the last. Imagine how difficult it would be to make every part of something live simultaneously just to learn that the redirect doesn't work right?