a heavy complement of older programming such as Pop! Goes the Country, Porter Wagoner's programs and The Wilburn Brothers Show, along with newer performances from heritage acts. CMT Pure Country, the all-music counterpart to CMT, relegated its classic country programming to a daily half-hour block known as "Pure Vintage" before abandoning classic country altogether by 2015. (Complicating matters somewhat is a relative lack of music videos for country music songs prior to the 1980s.) Classic country remains a popular block format on mainstream country stations, usually on weekends. Related formats As is the case with rock music (where classic rock, mainstream rock, and active rock all have varying amounts of older music), country music stations also can vary in the amount of "classic" content in their playlist, and formats exist for such stations. In addition to pure "classic country" stations, which play little to no current or recurrent country hits (i.e., recorded after about 2010), country music-formatted stations tend to fall under one of these formats: Traditional country: Primarily plays classic country but also plays newer country songs. Some traditional country stations feature a gold-based direction, drawing from country acts that were active in the 1990s and early 2000s (including new material and recurrents), and avoiding modern pop-influenced or "bro-country" songs. Adult country: Typified by the Nash Icon national format, adult country (there is no generally accepted name for the format) has a music set newer than a classic or traditional country station (almost never playing songs from before 1980) but not as reliant on current hits as a mainstream or hot country station. Such stations are more willing to play pop-oriented songs than classic or traditional country outlets. Nash Icon describes the format as an analogy: it is to country as adult contemporary is to top-40. Mainstream country (or modern country): The most common country music format. Unlike traditional country, mainstream country is generally bound to a top 40 chart for the majority of its playlist, but the format allows stations to fill out the remaining playlists with a mix of classic and recent recurrent songs. In the context of the music industry, "country radio" is largely driven by mainstream country stations. Hot country: Focuses exclusively on top 40 country music and – with the exception of a small number of recurrent hits no older than two or three years old – plays very little, if any, older music.