Metalcore is a subgenre of heavy metal music combining various elements of extreme metal and hardcore punk. The name of it is a portmanteau of the names of the two genres. The term took on its current meaning in the mid-1990s, describing bands such as Earth Crisis, Deadguy and Integrity. The earliest of these groups, Integrity, began performing in 1988; some modern practitioners of the genre include Killswitch Engage, Underoath, All That Remains, As I Lay Dying and The Devil Wears Prada. Metalcore is distinguished from other punk metal fusions by its emphasis on breakdowns: slower, intense passages conducive to moshing. The genre has had a saturation of bands in the last five years. Sepultura has been credited to "lay the foundation" for the genre.

Towards the end of the 1920s, a new form of Big Band emerged which was more authentically "jazz," in that more space was given to improvised soloing. This form of music never gained the popularity of the dance form of jazz. The few recordings made in this form of jazz were labelled race records and were intended for a limited urban audience. Few white musicians were familiar with this music, Johnny Mercer, Harold Arlen and Hoagy Carmichael being notable exceptions. The three major centres in this development were New York City, Chicago and Kansas City. In the former, a sophisticated approach to arranging predominated, first in the work of Don Redman for the Fletcher Henderson band, later in the work of Duke Ellington for his Cotton Club orchestra, and Walter 'Foots' Thomas for Cab Calloway's, Charlie Spivak and His Orchestra, and Mel Torm?'s Mel-Tones. Some big ensembles, like the Joe "King" Oliver outfit played a kind of half arranged, half improvised jazz, often relying on head arrangements. Other great bands, like the one of Luis Russell became a vehicle for star instrumentalists, in his case Louis Armstrong. There the whole arrangement had to promote all the possibilities of the star, although they often contained very good musicians, like Henry "Red" Allen, J. C. Higginbotham and Charlie Holmes. Others such as Alvino Rey grew popular with shows in New York City and then toured the country sharing their hit songs and new musical styles.