Second Life Viewer 2.x:
If can't hear the music stream in Second Life, toggle the play button at the top right of the Second Life viewer.

Second Life Viewer 2.1 Music Play button
If toggling the play button does not work, from the Second Life menu bar select Me > Preferences > Sound & Media tab. Verify that the 'Streaming music' box is checked and the volume slider it towards the right .
Make sure the 'All Media to auto-play' is checked.
Click OK.

Second Life Viewer 2.1 Sound & Media Preferences
Second Life Viewer 1.23 Issues:
If can't hear the music stream in Second Life, toggle the play button at the bottom of the Second Life viewer.

Second Life Viewer 1.23 Music Play button
If toggling the play button does not work, from the Second Life menu bar select Edit > Preferences > Audio & Video tab. Verify that the 'Play streaming music when available' box is checked. Click Apply and then OK.

Second Life Viewer 1.23 Preferences
Could not listen or connect to the stream or had other problems? Please let us know via e-mail. Thanks.