Music on Google Play, formerly known as Google Music, offers free storage for 20,000 songs, and any tunes you purchase from the company's music store do not count against your limit. You can listen to songs via Google's Music app for Android 2.2 or later, or you can use the .

If you live in the iOS ecosystem, Apple offers a service called iTunes Match that lets you upload 25,000 songs to iCloud for $25 per year. Your tracks, including iTunes playlists, then sync across your PCs and iOS devices.

Ubuntu One users can pay $4 per month or $40 per year to stream music from Canonical's cloud service. With your yearly subscription, you also get an extra 20GB of online storage, which gives you room for another 5000 songs. In addition, Ubuntu One offers music-streaming mobile apps for Android and iOS that include caching, so you can listen to your music without an Internet connection.

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