5th Bounce
DiatonicBelonging to a major mode — the notes, chords, and intervals of the scale
Sight-sing diatonic notes within a 5th from the previous.
Why
A 5th is a large, relatively rare melodic leap — master this, and you'll be able to navigate most melodies
Decide whether you want to try to interpolate from the previous sound, or try to bring to mind the feeling of the target and sing it using that