We'll create fresh WordPress site with Custom Dolly installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Based on the famous Hello Dolly plugin, Custom Dolly allows you to use any song you like (or speech, film, play or anything else).
After installation simply go to Appearance->Custom Dolly to add or edit your lyrics (you can copy/paste lyrics from any lyrics page on the internet or any other source), click the update button and Custom Dolly will show a random lyric on every admin screen.