Young girls playing piano duet
The Robinson Method Music Theory Lessons for the Very Young Musician by Patricia F. Robertson

Patricia F. Robinson

Music studio 

Where Every Student Is a Performer 

"Patricia F. Robinson developed a method of teaching music theory to students from ages 2-5 years. teachers and parents have been struggling with the issue of when to start teaching music lessons, resulting in either allowing the little ones to just imitate what they see musicians do or just waiting until the child is 5 or 6 years old before learning to read music."