When I Grow Up by Pussycat Dolls is in Em at 119 beats per minute and runs 3:58 across 64 bars. It uses 7 chords — N.C., Em, D, A, Am, Cmaj7, 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? When I Grow Up guitar melody tab.