Tinysong Create music links that make it easy to share music for free with your friends.

Twisten.fm is Twitter for Music -- Listen to the music being shared on Twitter in a free, continuous stream of songs.

Song.ly helps you share music found on the Web on Twitter.

Blip.fm Become a DJ and discover new music. Listen to a continuous stream of songs and DJ your own music station.

Twt.fm lets you share music on Twitter twt.fm will then generate a track page for you using your twitter page.

Twiturm The site lets users upload MP3 files, or point to existing MP3 links on the web, then share them directly on Twitter via a shortened URL that links to a Twiturm player page.

Twittytunes is a companion Firefox (and Flock) plugin for the Foxytunes music player plugin from Yahoo! Music. Twittytunes essentially adds a button to the Foxytunes player that lets users tweet about what they’re listening to in one click.

SongTwit is one of the newest options on this list, and lets you search imeem and YouTube for songs, point to MP3 links, or upload an MP3, M4A, WAV, WMA, OGG or ACC file.

Music sharing site imeem, on which many of the other sites in this round up rely, added their own “Tweet This” buttons a couple of months ago. It’s a pretty basic way to tweet about the music you’re listening to, essentially just sending you to Twitter with a pre-populated form field that includes the name of the artist and track and a link to the song’s page on imeem. But imeem has a huge library of music to search, so it’s definitely a good site to have in your arsenal when sharing music on Twitter.

Musebin lets you share your favorite albums and artists over Twitter using exquisitely tiny URLs made possible by using a domain with a non-standard character: http://.ws/ The shared URLs link to a simple page about the artist or album that includes information about the year of release, record label, cover art, links to additional info, and a stream of tweets about the artist.