Play It Again Sam: 12 Music Streaming Services Sound Off
Last.fm

A music site founded in the U.K. in 2002, last.fm has over 30 million active users enjoying its music recommendation services. Skewed towards audiophiles and concert-goers, last.fm houses a wealth of information on your favorite artists, providing photos, videos, bios, ringtones, news, charts, events, an option to purchase songs and add them to your library, radio stations that play similar artists, concert images and info, users listening to that artist, shoutboxes, journals, kitchen sinks. Okay, maybe not that last one, but still, an option-heavy site that can be easily customized using tools and plugins.
The last.fm music library contains well over 12 million individual tracks, and features The Scrobbler – an algorithm that helps you discover more music by examining the details of the songs you’ve listened to. It also automatically fills your library and updates it with what you’ve been listening to on your computer or iPod (if you have the last.fm music player app, the audioscrobbler plugin or are listening to the last.fm internet radio). Last.fm will also recommend concerts and events to users, as well as give them information on top music charts, a radio station creation option, and a community (forums, Twitter integration, last.fm groups).

Pricing: Free for users in the U.S., U.K. and Germany. Others require a subscription.
Availability: Web browser, Mac OS, Linux, iPhone, Android, BlackBerry, Sonos, Squeezebox, PS Portable, Nokia N900, Zune.
MOG

MOG is a paid subscription service and blog network that streams over 11 million tracks, and allows users to read content from user posts, music blogs and in-house editors. Users create profiles with information about their musical preferences and can read other users posts, recommend users with similar tastes and listen to 30 second samples of songs. Any song in MOG’s catalogue can be streamed to a users computer via their web browser, MOG will generate a continuous play queue based on the artist chosen by the user.
Partnered with Rhapsody, MOG enables users to create, share and discover playlists, and create radio stations (including 100% artist only stations). Users can log in with Facebook, or share via Facebook, Twitter and email. Play, pause, skip, and go back are all controllable from a media keyboard, and MOG will allow you to broadcast to any speakers using AirPlay.

Pricing: Free 14 day trial (ad supported). Basic: $4.99/month provides access to MOG via the web and Roku with no ads. Primo: $9.99/month allows all of that and supported mobile devices.
Availability: Web browser, Desktop player (Mac only). iPhone, iPod touch, Android, Roku, Logitech Squeezebox, Boxee Box, Nook, Motorola Xoom, Jambox by Jawbone, LG internet-ready TVs.
Zune Music Pass

Microsoft’s subscription music service allows users to download, stream and listen to as many songs from the Zune Marketplace as you could possibly desire. Music can be downloaded and synced on up to four different computers, Zune players and Windows Phones – and you can swap out a device every 30 days.
Although Zune Music Pass is only available on phones that use a Windows Live ID, you can stream music over the web, play them an unlimited number of times, download an unlimited number of songs to your computer, and sync an unlimited number of times to Windows Phones or Zune Players. Smart DJ gives you spontaneous playlists. However, even with all its functionality, the Zune brand has been on some shaky ground lately, with Microsoft pulling it, then not, then pulling it…then, not.

Pricing: Free 14 day trial. $9.99/month for unlimited music and music video streaming. Annual subscriptions also available.
Availability: Web browser, Zune music players, Xbox 360, Windows Phones.