Diatonic Audiation
Connect your voice to your instrument by singing what you hear or audiating. Become more aware of the character of each degree by feeling what singing them is like.
Why
Singing the degrees makes their distinct character against a root clearer
Singing a melody before you try to pick it forces you to pay close attention
A powerful goal is to be able to sing melodies freely and be able to find them on the instrument quickly — some say this is the only skill needed for improvisation
Audiation proves that you have truly internalized the degrees