 These "guajeos" became the essence of the genre when it was played by big bands, which did not perform the traditional sections of the danzón and instead leaned towards swing and jazz.By the late 1940s and early 1950s, mambo had become a "dance craze" in the United States as its associated dance took over the East Coast thanks to Pérez Prado, Tito Puente, Tito Rodríguez and others.In the mid-1950s, a slower ballroom style, also derived from the danzón, cha-cha-cha, replaced mambo as the most popular dance genre in North America.