Hear what changed
Hear two ascending scales on the same home note: major, natural minor, harmonic minor or ascending melodic minor. At most one note changes. Listen for 3̂, 6̂ or 7̂, counting the home note as 1̂. Sometimes nothing changes.
Listen first
The notation is hidden until you answer or choose to reveal it.
Listen to both scales before checking. Replay them as often as you like.
Replay the pair while following the notes and degree numbers. Hear how changing one note changes the character of the scale.