Each letter is a key on the on-screen piano below. Lowercase letters are white keys, capital letters are black keys. Open the piano and press them in order — no sheet music needed.
G C E C E D C A G · G C E C E D GAmazing Grace is built from wide, open leaps rather than steps — the opposite of Mary Had a Little Lamb. That makes it the ideal next step: your hand has to learn distances of a fourth and a fifth instead of creeping along neighbouring keys. The 3/4 flow also gives it the unhurried, hymn-like feel.
The opening is G C E C E D C A G, then G C E C E D G. In keyboard letters: o s f s f d s p o, then o s f s f d h.
Intervals. Unlike stepwise nursery rhymes, it jumps by fourths and fifths, so you learn to feel larger distances under your hand.