Once you build this experience, you'll gain confidence building upon individual notes and scales, reading sheet music, and you'll eventually feel more comfortable improvising.
But as soon as one artistic vision has dominance, the role of the large group as an improvising ensemble tends to become blurred.
It utilizes repetition in the manner of an improvising jazz musician.
We must picture him as a professional storyteller equipped with a mass of miscellaneous reading, a fluent power of narration, and a ready faculty for quoting, or at a push improvising, verses.
In fact, improvising using arpeggio sequences can make for better sounding solos.