On youtube how do you make those videos that say the lyrics to a song?

You mean when the lyrics are in the video/as the video? I don't believe there is a software... Most people copy and paste lyrics from sites such as Metrolyrics.com and time the lyrics to the music with some sort of video program. (Such as Windows Movie Maker) Nothing all too special, but it can be pretty time consuming. Hope that helps answer your question. (:

They make a VIDEO but instead of recording images, they use text. The text is made with some sort of computer software. Basically you are creating a digital video and you can assign the transitions (meaning changing the text) to the times in the song the music changes. Both songs and online videos have a time line that allows you to control what it looks like. If you have a Mac, stuff like this comes standard on the computer and is neither difficult or time consuming. Obviously it can become very complex with video editing etc if you want it, but most stuff done online is submitted as a hobby. It's actually very fun!