Hard Rock - is a genre of rock music characterized by the distinguished role of the so-called. rhythm sections, mainly bass and percussion instruments. Songs of this genre are often built on riffs in figures with a size of 4/4. Hard rock originated in the 1960s, took on familiar forms in the late 1960s and early 1970s, and it flourished in the early 1970s, with the participation of bands such as Led Zeppelin, Deep Purple and Black Sabbath. Heavy metal branched from hard rock to the mid-70s, giving rise to all of the "metal" music. The term "hard rock" is sometimes also used as a hyperonym for "heavy" genres such as heavy metal, grunge, etc.
By the beginning of the 70s, there were hard rock groups that are considered the actual founders of this genre and are the indisputable authorities of hard rock: Led Zeppelin, Deep Purple, Black Sabbath. After that, other groups began to appear, adopting the musical techniques of the “pioneer”, or already existing groups stylistically moving towards “weighting”. Among them are Status Quo, Queen, Nazareth, AC / DC, Uriah Heep, UFO, Grand Funk Railroad, Scorpions and many others.
Hard rock of the 1970s laid the foundation for the emergence of a heavy metal style and metal music in general.
In the 1980s, at the junction of hard rock and heavy metal, a commercially successful movement arose, sometimes referred to as Hard n Heavy. At that time, both new heavy rock bands (Guns N 'Roses, Mötley Crüe, Def Leppard) and representatives of the classic hard rock of the 1970s with their new works (former Black Sabbath vocalist Ozzy Osbourne, former vocalist's Whitesnake band) were very successful. Deep Purple by David Coverdale) and bands debuting around the mid-1970s (Aerosmith, AC / DC, Judas Priest). In parallel, the heavier metal directions developed, taking their roots in hard rock (thrash metal, speed metal and others).