3aspects involved in gaining a true appreciation for music

Music appreciation classes also typically include information about the composers, the instruments and ensembles, and the different styles of music from an era. Music appreciation courses are widely available in universities and colleges. Typically, these courses are designed for non-music majors.

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it seems to me that yes they solo on the chord changes.  coltrane for sure solos on the chord changes. instead of changing scales, they use a different method over the chord changes. this melody is very  unique but may often times even be considered simple, which is quite common in this modal  type. for example, there are changes from the key of minor to major in this piece, which makes it  unique in its own way.