Coldplay's haunting 'trouble' intro is another piece, like
Bring Me to life by Evanescence and the X-files theme
to use the following four notes as a starting point:
(This can be considered a B minor chord with a flat sixth, or, in Coldplay's case it is really a G chord with a 'major 7th' F sharp).
Try arpeggiating the notes to get a Coldplay-like effect:
Coldplay accompanies their tune with a series a chords which miraculously all fit with the same melody:
Sheet Music to buy by Coldplay
Viva La Vida By Coldplay. Piano Vocal. 8 pages. Published by Hal Leonard
The Best of Coldplay for Easy Piano "(Updated Edition). By Coldplay. For voice and easy piano. Hal Leonard Easy Adult Piano. Britpop and Alternative Rock. Difficulty: easy-medium. Songbook. Easy piano notation, lyrics and chord names. 56 pages. Published by Hal Leonard"
A Rush of Blood To The Head "By Coldplay. For voice, piano and guitar chords. Piano/Vocal/Guitar Artist Songbook. Britpop and Alternative Rock. Difficulty: medium. Songbook. Vocal melody, piano accompaniment, lyrics, chord names and guitar chord diagrams. 72 pages. Hal Leonard #0711
New Slang (by The Shins) and Yellow (by Coldplay) (Pop Hits for String Quartet Strings Charts Series). By Coldplay and The Shins. Arranged by Eric Gorfain. For string quartet. String. Softcover. 32 pages. Published by String Letter Publishing
Parachutes "By Coldplay. For voice, piano and guitar chords. Piano/Vocal/Guitar Artist Songbook. Britpop and Alternative Rock. Difficulty: medium. Songbook. Vocal melody, piano accompaniment, lyrics, chord names and guitar chord diagrams. 56 pages. Hal Leonard #0711
X & Y "By Coldplay. For voice, piano and guitar (chords only). Piano/Vocal/Guitar Artist Songbook. Britpop and Alternative Rock. Difficulty: medium. Songbook. Vocal melody, piano accompaniment, lyrics, chord names, guitar chord diagrams and black & white photos
Viva La Vida "By Coldplay. By Chris Martin, Guy Berryman, Jon Buckland, and Will Champion. Arranged by Mark A. Brymer. SATB. Pop Choral Series. 12 pages. Published by Hal Leonard"