I wonder the online Synchronous lyrics， how to do that?

Hai
One of the best site to download the lyrics is the "www.lyrics.com". It is widely used to download this lyrics. It is most populer site to downl;oad the lyrics. So go for this site and have a great enjoy and I am sure you definetely get all lyrics yop want.

My english is not very well. I mean, I need to design a web page, and it can play music & lyric at the same time. But thank you all the same.

If I understand correctly, you're looking to create a kareoke type thing where the website will play the song and display the lyrics to sing along with? If so, read on.

Okay so you've got several issues to deal with to make this a reality. First of all, you can just put any music on a website and call it legal. Allow your viewers to listen to mainstream stuff for free and you will have lawsuits coming in left, right and center. This means you will either have to acquire rights to play the music (will get quite expensive in my estimation) or find/make some royalty free music to play on your website, music that you can play without worries about copywrite claims like music under a Creative Comons license (read more: http://creativecommons.org ) or some of your own work.

Now to display lyrics and play music you have several options. For the music, you could use Flash to stream the song to the net, or you could embed an object like QuickTime or Windows Media Player or offer your viewers a choice between the two. for more information on that, search up Embedded Quicktime html or something like that in Google. For the lyrics, are you thinking of lyrics that show which part to sing at a specific moment like auto scrolling to the beat of the song? Or just displaying the lyrics on the page? If you're not scrolling anything, you can easily display the lyrics with some HTML code. If you are scrolling, you can do it via Javascript of Flash (other methods exist, these imo are the best) if you are using Flash to stream your song, you might aswell display the lyrics in the same file. You'll have to figure out how to sync the lyrics to the music by yourself. Same thing with Javascript + Quicktime/Windows Media Play.

On top of all this, if you want a dynamic, easily maintainable website where adding, removing, sorting and editing of all your songs is made easy and efficient, you'll have to code some sort of Content Management System in a programming language such as PHP or ASP, OR find a Content Management System (CMS) that already exists to suit your needs. Search up "Content Management Systems" on google and read up on a couple.

I hope this helps in your quest!
Sean