Here's a quick look at the three leading digital music storage lockers:
*Apple iTunes Match:
Price: $25 per year.
Likes: Matching feature much quicker than uploading; works seamlessly on iOS devices; good quality sound.
Dislikes: Not available for older iOS devices or non-iOS gadgets; activating service turns off Genius playlist feature; most expensive of three services.
*Amazon Cloud Player:
Price: $20 per year; includes 20 gigabytes of storage for documents and photos.
Likes: Works seamlessly on Kindle Fire; available for other Android devices and through Web on iPad; offers unlimited storage; less expensive than iTunes Match.
Dislikes: Uploading collection can take days; Uploader stalled out repeatedly, didn't recognize duplicates, didn't upload iTunes playlists, and does not automatically upload new songs bought outside Amazon; Web interface unusable on the iPhone.
Likes: Works seamlessly on standard Android devices; available on other devices through well-designed Web app; Music Manager automatically uploads iTunes playlists and new songs purchased outside of Google.
Dislikes: Uploading collection can take days; Music Manager stalled out multiple times while uploading and didn't recognize duplicate songs; no way to download songs to PC.