Crystal Ball by Keane is in Gb at 124 beats per minute and runs 3:02 across 52 bars. It uses 18 chords — Gb, Gb6, Db, Ebm, Bbm, Bbm7, Ab, Bbsus4, and a few more. The chord diagram changes as the song plays and the words light up as they are sung, so you can strum and sing along without reading ahead.
Want the melody line note by note? Crystal Ball guitar melody tab.