"Good improvisation communicates harmonic progression melodically. Effective melodies manipulate harmonic content through the use of guide tones and preparatory gravity notes, masterfully woven in systematic tension, release, and transparent harmonic definition."
We all have stage stories, dealing with the unexpected challenge of a stage interruption. A seasoned professional knows to adapt, sometimes exploit, as in the case of this Josh Williams Band performance at the Doyle Lawson Bluegrass Festival in Denton, NC last year. His bluegrass quartet's rendition of Mordecai included as special "guest" performance, as you'll see around 1:30 in this 3:15 clip:
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