JC-120 Jazz Chorus Roland 50th Anniversary Limited Edition Limited to just 350 amplifiers worldwide. A true legend in music history, the JC-120 has been in continuous production since 1975 and is Roland’s longest-running product. The 50th Anniversary Limited Edition Jazz Chorus offers the inspiring “JC clean” tone and the immersive stereo chorus of the standard model, plus a natural cherry wood finish, dark gray grille cloth material, and a commemorative badge with a hand-engraved serial number.