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.
Soul music dominated the U.S. African-American music charts in the 1960s, and many recordings crossed over into the pop charts in the U.S. Otis Redding was a huge success at the Monterey Pop Festival in 1967. The genre also became highly popular in the UK, where many leading acts toured in the late 1960s.