A process for converting standard musical notes to Ra format musical notes comprising inputting a signal of standard musical notes, analyzing the frequency of each note in the signal, selecting a Ra format natural harmonic resonance, converting the frequency of each note in the signal to a Ra format frequency corresponding to the selected Ra format natural harmonic resonance, and outputting a signal consisting of the converted notes. A apparatus including a processor capable of performing the inventive process on a signal of standard musical notes. The apparatus including a signal input port and a signal output port, means for converting the frequency of standard musical notes to a corresponding frequency of Ra musical notes, means for selecting a Ra format natural harmonic resonance, and a frequency analyzer.