Being a tech guy, I have tried many stuff form Grooveshark, last.fm to Pandora.
I also use iTunes, and always need sync with my mp3 player or iPhone before I can listing to music somewhere els other than my main computer.
on Amazon cloud it's deferent, when I buy a song, it automatically sync it to the cloud (virtual space on the world wide internet), Which I can access from my android or iPhone. Also when I am not at my computer, lets say I am traveling with my laptop I can access my media a purchased from a WiFi hotspot.
all I need is internet.
This is something new although you have to pay for the song's (which in my opinion isn't making the product worse) because every one needs to make money.
How to Get Started with Cloud Drive and Cloud Player
Step 1. Buy music and save it to Cloud Drive
Purchase a song or album from the Amazon MP3 Store and click the Save to your Amazon Cloud Drive button when your purchase is complete. Your purchase will be stored for free and will not count against your storage quota.
Step 2. Play your music in Cloud Player for Web
Click the Launch Amazon Cloud Player button to start listening to your purchase. Use Cloud Player to browse and search your library, create playlists, and download to your computer.
Step 3. Add more music from your personal library
From the Cloud Player screen, click the Upload to your Cloud Drive button. All customers start with 5 GB of free Cloud Drive storage. Upgrade to 20 GB with an MP3 album purchase (see details).
Step 4. Enjoy your music on the go with the Amazon MP3 app featuring Cloud Player
Install the Amazon MP3 for Android app to use Cloud Player on your Android device. Shop the full Amazon MP3 store, save your purchases to Cloud Drive, stream your Cloud Player library, and download to your device right from your Android phone or tablet.