Holy geez there are a lot of posts here. Okay, sorry I didn't have time to read all the posts here, but here goes:
Companies aren't supposed to have $4.5 billion dollars in the bank. They're not. So to all the people saying that even if Apple didn't complete a $4.5 billion + whatever deal, and only gave up half that amount of money, it would still be a great move for Apple. Most major deals don't involve cash. You ever notice that? Apple's lucky in a way, but they haven't been smart with their money either. The majority of companies out there don't have nearly that much money saved up for a rainy day. Its actually a very unorthodox business approach to save actual money. Even an accountant will tell you that a person should never have more than $10,000 or so in the bank. Money should never sit in the bank like that. Invest in something, say stocks, or purchase a home or condominium/flat to rent out, etc. Anything is better than large amounts of money in the bank.
Its the same with companies. If you don't do something with the money you've saved up, then you'll probably lose that money anyway since sales will fall if you don't invest in yourself, so you may as well spend it wisely now. You sink when you're stagnant, so don't stop moving. Many companies give some of their money away through dividends to shareholders so that they're doing something with it instead of nothing. For their money, what they get back are happy investors. That's also why Apple invests to release innovative products -- to not sit still. It would be wise if Apple did something with at least $3 billion out of their $4.5 billion, even if it ends up being a failure.
Something good will always come out of deals like this.
Buying Universal Music is a good place to put their money if they're planning to spend it somehow.

Integrating music and iTunes, and hopefully offering samples of music, or complete tracks from new artists could boost online sales of music. I purchase CD's online fairly frequently, and I never do so unless I can hear clips of every single song on an album, or unless I download the album first. Great integration potential this way.