Thought processes of seven artist-level jazz musicians, each of whom recorded an improvised solo, were investigated. Immediately after completing their improvisations, participants listened to recordings of their playing and looked at the notation of their solos as they described in a directed interview the thinking processes that led to the realization of their improvisations. In all of the interviews, artists described making sketch plans, which outlined one or more musical features of upcoming passages. The artists also described monitoring and evaluating their own output as they performed, making judgments that often were incorporated into future planning. Four strategies used by the artists for generating the note content of the improvisations emerged from the analysis: recalling well-learned ideas from memory and inserting them into the ongoing improvisation, choosing notes based on a harmonic priority, choosing notes based on a melodic priority, and repeating material played in earlier sections of the improvisation. (Contains 8 figures.)