[arethuza]

You do get to preview songs on iTunes - can't remember how long it is, but it's certainly long enough for me.

It appears that previews can now be up to 90 seconds:

http://techcrunch.com/2010/11/02/itunes-previews/

[bgarbiak]

For me: if it's not entirety - it doesn't count. Lala figured it out and I had hoped Apple will follow this path after they bought them. Sadly, they didn't.

[technoslut]

It's not a question of what Apple figured out but what the labels would allow. Frankly, the combination of Genius suggestions and 90 second previews should be enough for most.