SO RE ME FA SO LE TE DO
The natural minor is created from a major scale by lowering scale degrees 3 (MI), 6 (LA), and 7 (TI) to ME, LE, and TE.
Pardon my singing! I notice that I am a little flat at the top and bottom of the scales. Practice singing with me, with a piano, and then alone! Listen to see whether you are matching pitches. If you are unsure, record yourself and then listen to the recording!
