for absolute beginners - the point is, imo, to help them realize that music is kind of like math. once you figure out what scale is related to what (major/minor) - then you go beyond that with arpeggios and exercises and finally just the music.a student that doesn't know the circle of fifths is uninformed about how it all 'fits together.' scales, chords, harmonies.another exercise is to have them write the scale and then - add thirds atop - so they see the chords that go with each scale. i think when children are young they have an easier time memorizing all this information. and they don't have mental blocks as much. and, once they know it - they can use it later for many different purposes.