To enable this option under XBMC
Go to System > Skins > Add-on section
- Scroll to the Music OSD section
- Check "Enable Lyrics in Music OSD
- Click on "PATH TO LYRIS ADD-ON"
- In the case that you don't have any Lyrics add-on installed, then empty dialog (Lyrics) will be displayed
- Click on the "Get More..." button to download and install new add-ons.
- Once done press the Esc key to close the Settings window.