A Case Of You by Joni Mitchell is in Gb at 102 beats per minute and runs 3:38 across 60 bars. It uses 12 chords — Db, Gb, Bbm7, Ab, Ab7, Absus4, Bbm, Bbm(maj7), 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? A Case Of You guitar melody tab.