It’s Impossible by Perry Como is in G at 80 beats per minute and runs 3:32 across 37 bars. It uses 18 chords — G, G6, Gmaj7, Am7, D7, F#m7, B7, Em, 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? It’s Impossible guitar melody tab.