YouTube Lyrics is a great plugin script for Firefox by Aquilax which Adds a lyrics box to the YouTube sidebar under the video information box. It can search in eleven different lyrics sites and it shows also all the results in a drop down.
This Greasemonkey Script adds an iframe in the Music Video Page’s Sidebar which lyrics to the video is shown. The Lyrics are searched from 11 different Lyric Sites and displayed according to the Title of the Video. This means only popular music videos will show Lyrics. There is also Option to save the Lyrics which means now you can save the Lyrics as well as save the youtube video if you want.
This is only for firefox users.
1) Install Greasemonkey then
2) Install YouTube lyrics Script
Now visit any Youtube Video to See the Script in Action.