The melody of By The Grace Of God by Katy Perry runs 407 notes across 47 bars, 3:54 long in Eb at 80 beats per minute. The tab sits almost entirely in the first two frets, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? By The Grace Of God chords and lyrics.