Appendices Appendix A: Pinblock Woods Appendix B: Glues Used in Making Musical Instruments Appendix C: Why Soundboards are Made of Quartersawn Softwoods Appendix D: Soundhole Sizing and the Helmholtz Resonator Appendix E: Why Varying String Gauges are Used on Musical Instruments Appendix F: Why Even Hitch Pin Spacing Doesn’t Work Well Appendix G: Material Densities