Confessions by Usher is in Bbm at 96 beats per minute and runs 1:25 across 17 bars. It uses 12 chords — Dbmaj7, Cm7, Bbm7, Gm7, C7, Fm11, Fm7, Fm, 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? Confessions guitar melody tab.