The development of and art form is often marked by individuals or groups who create a new artistic style as a reaction to a previous style. Such was the case with a new style of jazz, called "cool." Cool jazz generally featured moderate tempos, vibrato-less playing, and a much more restrained approach. Musicians such as pianist/composer LennieTristano, and trumpeter Miles Davis were among the major exponents of this style, which met with relative commercial success and paved the way for the "west Coast " jazz sound that developed in the 1950s. Drummers often accompanied this style with brushes. The limited equipment demands of this style helped to "downside " the standard drum set: the bass drum was often 20 to 22 inches in diameter, and the tom-toms were 12 to 13 inches in diameter and 14 to 16 inches in diameter. Tom-toms were affixed to the bass drum by sturdy mounts, and by the late 1940s floor toms had removable legs. Bass drum began to appear with a revolutionary concept, "retractable" spurs. Many of these equipment changes reflected the less obtrusive role of the drummer in the cool style as well as accommodating the increased popularity of the small "club-date" combo rather than the big bands. Professional drummers, especially those who were living in New York or touring by car were demanding more portability in their equipment.