of, relating to, or shaped like a triangle; having three angles; triangular. 2. Crystallography. having threefold symmetry. Origin of trigonal.
An online survey conducted in the U.S. points out that the most popular music genre in the U.S. is rock, with 40 percent of respondents choosing this option. The second and third most listened to music genres are oldies and country respectively, while hip hop/rap is favored by a smaller niche of American listeners.
The United States has the world's largest music market with a total retail value of 4,481.8 million dollars in 2012, and its music is heard around the world. Since the beginning of the 20th century, some Forms of American popular music have gained a near global audience.