Here’s a question for fans of the District’s jazz scene. What do all of the following acts have in common? George Clinton’s P-Funk. Prince. Maceo Parker. George Duke. Stanley Clarke. Alex Bugnon. Lynyrd Skynyrd. Chuck Brown. The answer is that, at some point, all of them have hired trombonist Greg Boyer, a local musician who may not be a household name, but who has certainly garnered a reputation as a top-notch musician.