In-A-Gadda-Da-Vida by Iron Butterfly is in Gm at 120 beats per minute and runs 2:48 across 21 bars. It uses 9 chords — Dm, Am7, D, N.C., G, Em7, A, F#7, 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? In-A-Gadda-Da-Vida guitar melody tab.