XXX films -- See Pornographic films When subdivided by the appropriate geographic, topical, and/or form subdivisions, this heading is used for works about pornographic films.
Xylophone and piano music (Jazz) -- See Jazz Here are entered jazz instrumental works for two or more performers. Songs performed in jazz style by a vocalist or vocal group, with or without accompaniment, are entered under Jazz vocals. --headings for solo instrumental music followed by the parenthetical qualifier "(Jazz)," e.g. Piano music (Jazz); also headings that include the term "jazz ensemble" as a medium of performance, e.g. Concertos (Flute with jazz ensemble); Jazz ensemble with orchestra; Suites (Jazz ensemble); Vibraphone with jazz ensemble; and headings for individual musical instruments and families of instruments with the subdivisions Methods (Jazz) or Studies and exercises (Jazz)
