One of the more difficult tasks confronting the jazz musician is the necessity of improvising over chord progressions that often imply many keys in quick succession. Even standards of the repertoire rarely employ chords from a single key only. The opening measures of "Stella By Starlight" are a familiar example.
"A Model of Common-Tone Connections Among Jazz Scales,"
Journal of Music Theory Pedagogy: Vol. 23, Article 9.
Available at: https://digitalcollections.lipscomb.edu/jmtp/vol23/iss1/9