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1. Pandora: One of the most popular music player on the web.  Create an account to start with.  Building your own radio station with the songs and artists you like.  Pandora will keep playing unlimited songs matching with your interests.
2. Last.fm: Last.fm recommends music, video and concerts based on what you listen to.  Once you start playing music on Last.fm, it starts building your own station which you can play and share anytime you want.
   If you happen to be a Songbird user, then you can scrabble your songs to Last.fm so that they are available when you don’t have access to them.  There are many great features which I want you to try.
   You can even get FREE mp3 music downloads also.
3. Slacker: Similar to Pandora and others I mentioned, just search for the song on Slacker to play. There are some default stations created for you to get immediate access to popular songs also.
4. Blip.fm: Search for an artist or a song to play the song you want.  Create your own music station and share it with others.  Or you may listen to what others are playing on blip.fm. Blip.fm asks the twitter question of ‘What you are doing…?’ in a different way by asking ‘What are you listening…?’
5. imeem: imeem is a social network that enables users to discover, interact and express themselves with media, including music, video and photos, and form connections based on shared tastes and interests.
   You can create/upload your own music, videos, photos etc too and share this with you friends easily.
6. iLike: iLike helps people discover and share music, playlists, and concert alerts. The iLike Sidebar for iTunes and Windows Media Player suggests new music, creates automatic playlists, and connects people through music.
7. Lala: is the only service where you can not only listen to your favorite music but you can also buy it cheaper than iTunes and Amazon.
8. Jukefly: is a music player designed to play your music collection from anywhere. Or you can listen to 1000s of radio station already up there.  To start you need to sign-up and install a small app on your computer.  You don’t have to upload your collection to Jukefly.
9. Justhearit: is in private beta, but you can still search for a song and play audio and video from across the internet like YouTube and all.

(Image Source: Slacker Radio)
10. Mixtape.me: Similar to other service, just search, listen and create your own playlist or browse for Popular lists already on Mixtape.me.
11. Grooveshark: Good quality songs are available for you to listen and share with your friends and followers on twitter, Facebook etc.  Just search for a song to start with or browse a library of millions of songs.
12. Songtwit: Search for a song, preview it, login with twitter and post your message along with a link to the song.
13. Tinysong: is actually powered by Grooveshark.  Tinysong actually provides you a link to the song you search which you can add in your message or tweet to share it with your friends.
14. Twisten.fm: It is really an amazing service which converts twitter into a radio station by searching tweets having links to songs.  This is a nice way of checking out popular songs people are listening and sharing on twitter.  Just login with your twitter credentials to start listening to music.
15. Twiturm: lets you search and share a song on twitter.  You can also listen to them by browsing for new music with Genre.
16. Twt.fm: is not exactly a place for listening to music but you can search for a song or an artist, preview the song and then share it on Twitter.  Twt.fm will create a song page with your twitter background for your followers to listen to it.  Who said you can’t listen to music on your own page?
17. Song.ly: Same concept as twt.fm but Song.ly has got browser add-ons which makes it easier to share songs and listen to them on the landing page.
18. MusicIndiaOnline: If you want to listen to Hindi songs, then this is one of the choices.
19. Raaga: Raaga is also a choice for Hindi, Tamil, Bengali, Punjabi and other regional Indian songs.
20. You add it… This list is no way near to complete because there are so many cool services people use to listen to their favorite music that I don’t even know.  I would request you to please add it in the comments with some details as to why you like it and how do you use it. (if possible)

On iPhone:

1. Last.fm (iTunes link)
2. Pandora (iTunes link)
3. iMeem (iTunes link)
4. Slacker Radio (iTunes link)
5. AOL Radio (iTunes link)
6. SHOUTcast Radio (iTunes link)
7. Y! Music (iTunes link)

All of these services mentioned above have iPhone applications.  They provide you unlimited choice of songs you can listen to on the GO.  Pandora, iMeem, Last.fm and Slacker lets you search for an artist or favorite song and then play a station based on that.  Whereas AOL Radio, Y! Music and SHOUTcast Radio have a wide array of preselected Radio stations.
Now, tell me with these many choices will you ever have to worry about music anymore. And as I said this post is not at all complete unless I take readers input because lot of cool services are still untouched.  I would request you to please drop a comment on this post so as to let everyone know which service you use and love.
Don’t forget to bookmark, share this article if it gave you some links to the service you didn’t know about.