When someone is listening the free improvisations of the famous violonist Stephan Grappelli he is amazed from the reachness and beauty of the melodic improvisation
When the melodic perception is trained two obervations are readily made that reveal part of the factors of beauty and richness
A) Each melodic phrares is not limited as usually in 1-1,5 octaves, but it gives the sence of freedom by expanding in to no less than whole 3 octaves!
B) The rhythmic density of the melody is in to 3 separated and not mixed areas ,the very slow, the normal , the very fast.
E.g. very slow= whole or more and certainly not faster that halfs , (nirvana, alpha brain waves )
Normal=1/4 quarters (normal talking, beta brain waves)
Very fast =1/16 sixteenths (furious or crazy dance, gamma brain waves)
In this way one does not get bored listening while he feels free and with wide range of emotions or brain waves (gamma, beta, alpha).
C) Besides waving around melodic centers at slower or middle parts, and creating some repetitive melodic themes patterns, there is also runs that are like sweep picking in guitar among two chords of the scale that are neighboring in other words in chromatic relation. (see post 215 )
