Once You Lose Your Heart by Noel Gay is in Gb at 100 beats per minute and runs 2:06 across 51 bars. It uses 42 chords — Db, Dbmaj7, Fm7b5, Bb7sus4, Bb7, Eb7sus4, Eb7, Ab11, 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? Once You Lose Your Heart guitar melody tab.