Happy Days by Pratt & McClain is in Bb at 150 beats per minute and runs 1:05 across 35 bars. It uses 8 chords — F, Dm, Gm, C, A, Bb, B, G. 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? Happy Days guitar melody tab.