Abstract: A portable resonating platform for enhancing the tone of a cello comprises an upper plate and a lower plate rigidly joined in spaced-apart relation. The upper plate has a groove extending laterally along the top surface in which the endpin of the cello can be received in any desired position along the length of the groove. The platform is connected to the cellist's chair by a T-bar structure to prevent the platform from slipping during use. The cellist can adjust the position of the platform relative to the chair, which, in conjunction with placement of the endpin of the cello along different positions within the groove, allows the highest degree of comfort possible.