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.
One of the earliest styles of rock and roll music, dating to the early 1950s in the United States, especially the South. As a genre it blends the sound of American folk and Western musical styles, such as country and bluegrass, with that of rhythm and blues, leading to what is considered classic rock and roll.