Oxygen by Colbie Caillat is in Ab at 76 beats per minute and runs 3:35 across 43 bars. It uses 5 chords — Eb, Ab, Bb, Fm7, Ebmaj7. 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? Oxygen guitar melody tab.