www.piano-sheet-music.piczo.com/randomsheetmusic if they don't have what you're looking for just request it.
music notes dot com. its not free but its there
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.
It could be, you can find beginner sheet music if you need it.
www.google.com/music.coldplay/sheetmusic
The sheet music to that piece shows it in Eb major.
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.
You can find sheet music for vocals at music stores, online music retailers, and websites that specialize in sheet music for singers.
You can find sheet music for the keyword "piano" at music stores, online sheet music websites, and libraries that have a music section.
You can find sheet music for violin at music stores, online music retailers, and websites that specialize in sheet music for various instruments.
You can find the sheet music for "Pictures at an Exhibition" at music stores, online sheet music websites, or libraries that have a music section.
Where can you find the piano music sheet to...The Amapola
You can find humoresque sheet music for violin at music stores, online sheet music websites, or by searching for it in a library's music collection.