I Need To Know by Tom Petty And The Heartbreakers is in E at 120 beats per minute and runs 2:35 across 27 bars. It uses 7 chords — E, D, Dsus, C, A7, E7, B7. 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? I Need To Know guitar melody tab.