If I Had You by Adam Lambert is in Em at 130 beats per minute and runs 3:18 across 63 bars. It uses 9 chords — N.C., C, Em, Dsus, D, Bm, D5, E5, 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? If I Had You guitar melody tab.