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.
music notes dot com. its not free but its there
The sheet music to that piece shows it in Eb major.
http://www.scribd.com/doc/7079454/This-is-Me-Piano-Sheet
It could be, you can find beginner sheet music if you need it.
Guitar solos are not generally read from sheets, rather they are improvised on the spot through the musician's musical talent. As such, sheet music for this is unavailable.
Sheet music for the Acoustic guitar can be located for free and purchase online on websites such as Amazon, Pronto, Sheet Music Plus, Download Sheet Music Online, and Play Acoustic Guitar.
music notes dot com. its not free but its there
Electric violins can play the same sheet music as an acoustic violin.
www.google.com/music.coldplay/sheetmusic
www.piano-sheet-music.piczo.com/randomsheetmusic if they don't have what you're looking for just request it.
The sheet music to that piece shows it in Eb major.
There is no difference in the sheet music used for electric and acoustic instruments. Both use the same sheet music so that the same notes are played and in the same way.
http://www.scribd.com/doc/7079454/This-is-Me-Piano-Sheet
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.
http://www.hochweber.ch/guitar.htm
It's called sheet music.
It could be, you can find beginner sheet music if you need it.