Rock Island, city, seat (1833) of Rock Island county, northwestern Illinois, U. Dec 29, 2025 · Rock, in geology, naturally occurring and coherent aggregate of one or more minerals. It lies on the Mississippi River (bridged to Iowa) at the mouth of the Rock River and opposite the island for which it was named. The immediate consequence was folk rock. Jan 6, 2026 · The Beatles’ success suggested that it was possible to enjoy the commercial, mass-cultural power of rock and roll while remaining an artist. Jan 6, 2026 · The trouble is that the term rock describes an evolving musical practice informed by a variety of nonmusical arguments (about creativity, sincerity, commerce, and popularity). The three major classes of rock are igneous, sedimentary, and metamorphic rock. Rock music is a form of popular music that emerged in the 1950s and can be defined as “a form of music with a strong beat”—it is difficult to be much more precise. Dec 30, 2025 · Rock and roll, style of popular music that originated in the United States in the mid-1950s and that evolved by the mid-1960s into the more encompassing international style known as rock music, though the latter also continued to be known as rock and roll. It originated in the United States and spread to other English-speaking countries and across Europe in the 1960s.

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