Classic rock is a radio format which developed from the album-oriented rock (AOR) format in the early 1980s. In the United States, the classic rock format features music ranging generally from the mid-1960s to the late 1980s, primarily focusing on commercially successful hard rock popularized in the 1970s.  The radio format became increasingly popular with the baby boomer demographic by the end of the 1990s. 
Although classic rock has mostly appealed to adult listeners, music associated with this format received more exposure with younger generations of listeners with the presence of the Internet and digital downloading.  Some classic rock stations also play a limited number of current releases which are stylistically consistent with the station's sound, or by heritage acts that are still active and producing new music. 
The classic rock format evolved from AOR radio stations that were attempting to appeal to an older audience by including familiar songs of the past with current hits.  In 1980, AOR radio station M105 in Cleveland began billing itself as "Cleveland's Classic Rock," playing a mix of rock music from the mid-1960s to the present.  Similarly, WMET called itself "Chicago's Classic Rock" in 1981.  In 1982, radio consultant Lee Abrams developed the "Timeless Rock" format which combined contemporary AOR with rock hits from the 1960s and 1970s. 
KRBE, an AM station in Houston, was an early classic rock radio station. In 1983 program director Paul Christy designed a format which played only early album rock, from the 1960s and early 1970s, without current music or any titles from the pop or dance side of Top 40.  Another AM station airing classic rock, beginning in 1983, was KRQX in Dallas- Fort Worth.  KRQX was co-owned with an album rock station, 97.9 KZEW. Management saw the benefit in the FM station appealing to younger rock fans and the AM station appealing a bit older. The ratings of both stations could be added together to appeal to advertisers. Classic rock soon became the widely used descriptor for the format, and became the commonly used term, among the general public, for early album rock music.
In the mid-1980s, the format's widespread proliferation came on the heels of Jacobs Media's (Fred Jacobs) success at WCXR, in Washington, D.C., and Edinborough Rand's (Gary Guthrie) success at WZLX in Boston. Between Guthrie and Jacobs, they converted more than 40 major market radio stations to their individual brand of classic rock over the next several years. 
Billboard magazine's Kim Freeman posits that "while classic rock's origin's can be traced back earlier, 1986 is generally cited as the year of its birth".  By 1986, the success of the format resulted in oldies accounting for 60–80% of the music played on album rock stations.  Although it began as a niche format spun off from AOR, by 2001 classic rock had surpassed album rock in market share nationally. 
During the mid-1980s, the classic rock format was mainly tailored to the adult male demographic ages 25–34, which remained its largest demographic through the mid-1990s.  As the format's audience aged, its demographics skewed toward older age groups. By 2006, the 35–44 age group was the format's largest audience  and by 2014 the 45–54 year-old demographic was the largest. 
Typically, classic rock stations play rock songs from the mid-1960s through the 1980s. Some of the songs overlap with those played on oldies or classic hits stations, but classic rock also focuses on hard rock and heavy metal bands and artists that are less radio friendly and therefore are usually not played on oldies stations.[ citation needed] Classic rock stations have historically been hesitant to add 1990s rock such as alternative rock and grunge to their playlists, due in part to the drastic difference in style, but (mirroring a similar trend in classic country, where a similar 1990-era divide also exists) a small number of classic rock stations began adding 1990s music in the early 2010s.  Unlike AOR radio stations, which played all tracks from albums, classic rock plays a much more limited playlist of charting singles and popular album tracks from artists and bands.
—Roy Shuker 
Music scholar Jon Stratton traced classic rock's origins to the emergence of a classic-rock canon.  This canon arose in part from music journalism and superlative lists ranking certain albums and songs that are consequently reinforced to the collective and public memory.  Robert Christgau said the classic-rock concept transmogrified rock music into a "myth of rock as art-that-stands-the-test-of-time", and believed the canonizing of certain rock artists by critics, major media, and music establishment entities such as the Rock and Roll Hall of Fame was inevitable.  Media academic Roy Shuker said classic-rock radio programmers largely play "tried and proven" hit songs from the past based on their "high listener recognition and identification"; he identified white male rock acts from the Beatles' Sgt. Pepper era through the end of the 1970s as the focus of their playlists.  As Catherine Strong observed, classic rock songs are generally performed by white male acts from either the United States or the United Kingdom, "have a four-four time, very rarely exceed the time limit of four minutes, were composed by the musicians themselves, are sung in English, played by a 'classical' rock formation (drums, bass, guitar, keyboard instruments) and were released on a major label after 1964." 
The mindset underlying classic rock was regarded by Christgau as politically regressive; he said the music eschewed ironic sensibilities in favor of unintellectual, conventional aesthetics rooted in Victorian era Romanticism, while downplaying the more radical aspects of 1960s counterculture, such as race, African-American music, politics, and pop in the art sense. "Though classic rock draws its inspiration and most of its heroes from the '60s, it is, of course, a construction of the '70s", he wrote in 1991 for Details magazine. "It was invented by prepunk/predisco radio programmers who knew that before they could totally commodify '60s culture they'd have to rework it—that is, selectively distort it till it threatened no one ... In the official rock pantheon the Doors and Led Zeppelin are Great Artists while Chuck Berry and Little Richard are Primitive Forefathers and James Brown and Sly Stone are Something Else."  Regarding the development of classic rock, Christgau points to the compromised socioeconomic security and diminishing collective consciousness of a new generation of listeners in the 1970s, who succeeded rock's early years during baby-boomer economic prosperity in the United States. "Not for nothing did classic rock crown the Doors' mystagogic middlebrow escapism and Led Zep's chest-thumping megalomaniac grandeur. Rhetorical self-aggrandizement that made no demands on everyday life was exactly what the times called for."  Shuker attributed the rise of classic-rock radio in part to "the consumer power of the aging post-war 'baby boomers' and the appeal of this group to radio advertisers". In his opinion, classic rock also produced a rock music ideology and discussion of the music that was "heavily gendered", celebrating "a male homosocial paradigm of musicianship" that "continued to dominate subsequent discourse, not just around rock music, but of popular music more generally." 
- List of music radio formats
- Music radio
- Active rock
- Mainstream rock
- Adult album alternative
- Rockism and poptimism
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