Angel by Sarah McLachlan is in Gb at 59 beats per minute and runs 3:45 across 36 bars. It uses 10 chords — Db, Db6sus4, Ebm7, Gb, Bbm, Ab, Absus4, Ab6, 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? Angel guitar melody tab.