The guitar of claim 12, wherein the instrument body has a thickness of no greater than 1.75″, as measured perpendicular to the top cover.ġ5. The guitar of claim 12, wherein the single internal cavity has a volume of at least 150 cubic inches and no greater than 160 cubic inches.ġ4. A guitar comprising: an instrument body defining at least one internal cavity a soundhole attached to a soundhole rim of the instrument body via a notch in a top cover of the instrument body, the soundhole having a first sidewall shape defined by a first continuously linear sidewall and a first continuously curvilinear sidewall extending a length into the instrument body to provide an altered resonance frequency of the instrument body and an insert attached to the soundhole, the insert having a second sidewall shape defined by a second continuously linear sidewall and a second continuously curvilinear sidewall, the first sidewall shape being different than the second sidewall shape.ġ3. The apparatus of claim 10, wherein the transition region comprises a curvilinear surface extending from a top surface of the top cover to the notch.ġ2. The apparatus of claim 1, wherein the notch is positioned between a transition region and the continuously linear sidewall.ġ1.

The apparatus of claim 1, wherein the altered resonance frequency is 175 Hz.ġ0. The apparatus of claim 1, wherein the soundhole length is at least 1″ and no greater than 1.25″.ĩ. The apparatus of claim 1, wherein the top cover is positioned in a recess of the instrument body.Ĩ. The apparatus of claim 1, wherein the soundhole has a circular shape in a plane parallel to the top cover.ħ. The apparatus of claim 1, wherein a neck continuously extends from the instrument body.Ħ. The apparatus of claim 3, wherein the soundhole is aligned with, and disposed between, the neck and bridge directly below strings extending from the bridge to a headstock portion of the neck.ĥ.

The apparatus of claim 1, wherein the top cover supports a bridge and at least one electronic pickup.Ĥ. The apparatus of claim 1, wherein the instrument body is a hollow body electric guitar body.ģ. An apparatus comprising: an instrument body defining at least one internal cavity and a soundhole attached to a soundhole rim of the instrument body via a notch in a top cover of the instrument body, the soundhole having a continuously linear sidewall and a continuously curvilinear sidewall extending a length into the instrument body to provide an altered resonance frequency of the instrument body.Ģ.

Single stringed instrument