Black Keys by Jonas Brothers is in Gb at 75 beats per minute and runs 3:44 across 65 bars. It uses 8 chords — Bbm7, Db, Absus, Ab, Gb6, Gbmaj7, Gb, Ebm7. 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? Black Keys guitar melody tab.