Many people love the idea of being able to access all of their favorite music on demand for one low monthly price, rather than having to pay for and store individual titles, whether physically or digitally. Music streaming services are a great way to access all-inclusive libraries. It makes sense to stream music when it becomes easily mobile, or when you can enjoy it at home on your high-quality home audio system.
When you listen to the radio, you also have to listen to the advertising they pepper in between playlists. That is how the artists and the radio station are paid for the service they provide of entertaining us. But when you stream music, it is advertising free, because the consumer pays for the service, rather than the advertiser. The biggest benefit obtained from you paying up front (besides enduring 15 minutes or so per hour of advertising) is you get to play what you love.
Many of us grew up on radio, and we relied on it to keep us up to date on musical trends and introduce us to the hottest new bands. Stream services provide that through social sharing components.
One benefit to radio over streaming is that you will be able to hear the newest, hottest releases before it may become available on the stream services. The reason for this is very similar to why you don't see the newest, hottest movies on subscription services - artists want to maximize profits. For people who have *got* to have the newest movie or song, they can pay for a physical DVD or CD, or purchase a digital copy of it.
For music streaming, two excellent services are Rhapsody and Rdio. Rhapsody has more functionality, but Rdio has a larger selection of plans to choose from for various price points. Check out both for free and see which works for you. Rdio doesn't require a credit card to test drive their free service.
Over 15 million songs; several plans to choose from at various price points: