Identify the genre - Apr. 16th

X is a music genre. From its early development until the present, X has incorporated music from 19th and 20th century American popular music. Experts say that X differs from European music in that it has a "special relationship to time, defined as 'swing'", "a spontaneity and vitality of musical production in which improvisation plays a key role"; and "sonority and manner of phrasing which mirror the individuality of the performing musician".

The origin of the word X is one of the most sought-after word origins in modern American English. The word began as a West Coast slang term around 1912, the meaning of which varied but which did not refer to music at that time. In the sense of pep and enthusiasm, X continued in use in California for several years before being submerged by the music meaning of the word.