In the very smallest kits, in jazz, and at very high volumes, ride cymbals may be played in with the technique and sound of a crash cymbal. Some hi-hats will also give a useful crash, particularly thinner hats or those with an unusually severe taper. At low volumes, producing a good crash from a cymbal not particularly suited to it is a highly skilled art. Alternatively, specialised crash/ride and ride/crash cymbals are specifically designed to combine both functions.
The hi-hat cymbals (nicknamed "hats") consist of two cymbals mounted facing each other on a metal pole with folding support legs that keep a hollow support cylinder standing up. Like the bass drum, the hi-hat has a foot pedal. The bottom cymbal is fixed in place. The top cymbal is mounted on a thin pole which is inserted into the hollow cymbal stand cylinder. The thin pole is connected to a foot pedal. When the foot pedal is pressed down, a mechanism causes the thin pole to move down, causing the cymbals to move together. When the foot is lifted off the pedal, the cymbals move apart, due to the pedal's spring-loaded mechanism. The hi-hats can be sounded by striking the cymbals with one or two sticks or just by opening and closing the cymbals with the footpedal, without striking the cymbals. The ability to create rhythms on the hi-hats with the foot alone enables drummers to use both sticks on other drums or cymbals. Different sounds can be created by striking "open hi-hats" (without the pedal depressed, which creates a noisy sound nicknamed "sloppy hats") or a crisp "closed hi-hats" sound (with the pedal pressed down). As well, the high hats can be played with a partially depressed pedal.
Budget constraints and space considerations in musical theatre pit orchestras led bandleaders to pressure fewer percussionists to cover more percussion parts. Metal consoles were developed to hold Chinese tom-toms, with swing-out stands for snare drums and cymbals. On top of the console was a "contraption" tray (shortened to "trap"), used to hold items like whistles, klaxons, and cowbells, so these drums/kits were dubbed "trap kits". Hi-hat stands became available around 1926.
In 1929, when the stock market crash resulted in a global depression, one of the things that helped people cope with the trying years was swing jazz music. By the early to mid 1930's, big band swing was being embraced throughout the US, becoming the country's most popular form of music. The other contributing factor to the big band's success during the 1930s was the popularity of radio. The drum kit played a key role in the big band swing sound. Throughout the 1930s Chick Webb and Gene Krupa at the Savoy Ballroom in Harlem, increased the visual and musical driving force of the drummer and their equipment by simply being so popular and in demand- and they ensured that their drum kits became not only functionally developed but dazzling and well designed. Jazz drummers were influential in developing the concept of the modern drum kit and extending playing techniques. Gene Krupa was the first drummer to head his own orchestra and thrust the drums into the spotlight with his drum solos. Others would soon follow his lead.