Mermaid by Train is in Fm at 208 beats per minute and runs 2:52 across 90 bars. It uses 9 chords — Ab, Bb, Cm, Gm, Eb, Fm, G7, Cb, 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? Mermaid guitar melody tab.