When Adolphe Sax invented the saxophone, he specified the shape of the interior of the mouthpiece as being large and round. All saxophone mouthpieces were made in this style until the 1930s, when the advent of big-band jazz made saxophonists experiment with different shapes of mouthpieces to get a louder and edgier sound. A "baffle", or section of the mouthpiece roof sloped close to the plane of the reed, became a design feature for enhancing volume and projection. Between 1940 and 1960, it became common for classical saxophonists to use narrow-chamber mouthpieces based on those designed for jazz use. These mouthpieces give the instrument a brighter and edgier sound (more high partials) than the traditional shape as designed by Sax. One saxophonist and teacher, Sigurd Raschèr, spoke out against this change in mouthpiece design. He believed that when used in classical music, the saxophone should sound as its inventor, Adolphe Sax, had intended, and that the gradual change to narrower and "brighter" sounding mouthpieces was a distortion of Sax's tonal concept. His students and other disciples felt that the desirable tone for a classical saxophone was a softer, rounder sound—a sound that can only be produced by a mouthpiece with a large, rounded interior (often referred to as an "excavated chamber"). By 1970, narrow-chambered mouthpieces had become nearly universally popular for playing in an environment with amplified instruments, and virtually all new designs featured a narrow chamber, high baffle, or both. Large-chambered and low-baffle pieces continue to be produced for those who seek the tonalities of classical music and "classic jazz."