iTunes Match
What is iTunes Match? It's a subscription service from Apple and it stores your entire iTunes music library on iCloud. So, you can access and listen to your entire music library wherever you are. iTunes Match works not only for the music you've purchased from the iTunes Store, but also for the music that you've purchased from other sources, including music imported from a CD. iTunes Match also lets you download higher a quality of your current songs for free.
iTunes Match makes it easier for you to listen to any music on your library, without syncing it first to your Mac or PC. Since it's streaming music from the Internet, make sure you have a stable Internet connection, or that you've subscribed to a cellular data plan for your iPhone.
To use this service, you will have to pay USD 24.99 per year in the United States, at the time of writing this book. Prices may vary in other countries and can be changed from time to time. Just like in my country, Indonesia, iTunes Match costs...