First u go to Windows Media Player , then , go to Now Playing and u can see the list.U choose Plug-ins, and u choose other and choose Windows Live Mesenger Music Plug-ins.
Second u go to Windows Live Messenger. U go to Tool and choose the option at the bottom site. After u click in u can see the sentence about plug-ins (show song infomation from Windows Media Player as a personal messenger).
*Windows Media Player-Now Playing>Plug-ins>Other>Windows Live Mesenger Music Plug-ins
*Windows Live Messenger-Tool>Option>tick(show song infomation from Windows Media Player as a personal messenger)