When Apple introduces the iCloud service next week, it will likely be very different than both Google’s Music Beta and Amazon’s Cloud service. Both of those existing services require users upload all of their music, but Apple will skip this step. With iCloud, Apple will match music in your library and then make it available in the cloud. Obviously a much faster and streamlined approach. There have been stories of people spending almost 24-48 hours uploading massive collections to Google’s Music Beta. Removing this step would certainly boost adoption.
There will always be music that might not necessarily be available in iTunes. What about vintage Mink from 1985 that’s sitting in my iTunes collection? Perhaps Apple provides users a bucket that will transfer remaining songs, not currently available in iTunes. We’ll certainly find out more next week at WWDC when iCloud is demonstrated, but this sounds like a good first step.