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[Music Beta by Google] 20,000 songs. All songs need to be uploaded to Google's servers. [Amazon Cloud Player] Unlimited for Amazon purchases. For songs that weren't bought from Amazon, the limit is anywhere from 5GB to 1TB (that works out to around 740 to 152,000 songs, assuming each song is around 4 minutes long recorded at 255Kbps). Songs need to be uploaded to Amazon's servers. [iTunes on iCloud] Unlimited for iTunes purchases. Everything is stored in the cloud. If you subscribe to iTunes Match, songs not bought on iTunes are "scanned and matched." You only have to upload the songs that can't be matched. There is a limit of 25,000 songs for songs that are not purchased on iTunes. A separate 5GB cap applies only to documents, mail, and backup. [0] 
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Music wars: Google vs. Amazon vs. Apple | The Download Blog - CNET Download.com
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