Volvió la luna a la playa
para jugar otra vez,
pero estaba entretenido
jugando con otro pez.
Volvió la luna a buscarlo
y como no apareció,
se puso a contar corales
y aburrida se durmió.

Que intención quiso dar el autor?

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.