Abstract: Microphone boom holder assembly comprising a short, solid base rod or tube member adapted to be receivingly engaged in a tubular supporting leg of a music stand or an A-frame recording assembly, a top shoulder, a securing member, preferably a rollpin or knurled nut, and a threaded upper rod. The base member is preferably made of a solid piece of aluminum with a plurality of grooves extending externally along its length. The base member is inserted into a tubular supporting leg of an A-frame music recording assembly to the point at which it is stopped by the shoulder. The aluminum provides sufficient strength to prevent the boom holder of this invention from breaking under the weight of the microphone boom or other holder unit under vibrationally stresses use conditions.