You may be able to find the sheet music in a music store. 'Viva la Vida' has the same melody as about eight other published songs, so you might be able to find the sheet music for one of those.
Your local music store.
Tomi Petteri Putaansuu
Music Notes is a really good site to get original digital sheet music for songs at a reasonable price. It does cost, but you get the music instantly because it is a digital copy so you can print and use it straight away.
Check out this site. http://www.mycoldplay.com/home/2008/07/12/sheet-music-for-coldplays-violet-hill-and-viva-la-vida/ It has all of Coldplay's best songs in Pdf. form. It's Great! Or alternatively, instead of looking at a dead-end site, go here: http://www.abcmusic.net/download/free-sheet-music/265/coldplay/lost.aspx There's a small download button on the right side, but it has it. If you don't want to download it, then you'll need to look for another. The music itself is not perfectly like the acoustic version, but it's good enough that you can improvise it to.
Chris Martin, the lead vocalist of Coldplay, writes all their music.
You can find the piano sheet music for songs from Klonoa Door to Phantomile at MediaFire.
We should get sheet musics on internet on some websites
ABBA's music is protected by copyright laws so they are not available for free. But there are many online sites where you can order the sheet music, either by mailof download and print the sheet music from you computer. Musicnotes is the site I use and it is very easy and quick.
You can get anime sheet music for viola here: http://www.animeonstrings.org/violasheets.htm
I'm looking for Cri Cri sheet music too - where can it be found?
These are known as sheet music