Abstract: An ergonomic musician's stool or chair, comprising of a sitting surface at the top, which is supported by a support frame or structure with a number of legs attached. One or more of said legs having the ability to telescope to be able to be of a different length than at least one, and possibly more, of the other said legs. The ability to adjust the length of one or more of said legs gives a user the ability to affect the pitch, or lack thereof, of said sitting surface. This allows the user to affect the position and tilt of their pelvic region, the outcome being an overall benefit to the user's posture. An ergonomic attachment for a musician's stool or seat comprising a receiving piece capable of securely connecting to the stool or seat's supporting frame or leg, a telescoping foot or leg piece, a locking mechanism allowing said telescoping foot or leg piece to be locked or held into a desired position or length, and a self-leveling foot-base.