XMusicShare tries to detect the song you are currently listening to (works only on Windows Phone 8.x because Microsoft removed the API in Windows 10)
If your song is not on the Groove Music catalog or you are on Windows 10 (Mobile), just use the search function to find your song
Sharing made easy
XMusicShare can be used as standalone or via UniShare on Windows Phone 8.x. The app lets you share any combination of artist, album, song name, album image and link to the Groove Music catalog with a few taps.