A compilation album comprises tracks which are compiled from other recordings, either previously released or unreleased. The tracks must be from several performers; if from several performers there may be a theme, topic or genre which links the tracks. When the tracks are by the same recording artist, it is considered an anthology, the album may be referred to as a retrospective album. Compilation albums may employ traditional product bundling strategies.
Common types of compilation include:
- "Greatest hits", "best of", or "singles collection" LPs, gathering together an artist's or a group's best-known songs. If the artist or group continues to record, compilers commonly include one or more previously unreleased tracks as an incentive for fans to buy the album, even if they already have the other material on the compilation.
- Other single-artist compilations, such as rarities or B-side collections, albums compiled from radio sessions, songs performed by an artist exclusively for a film soundtrack or collections that combine multiple releases, such as LPs and EPs together on one or more compact discs. Such compilations generally target existing fans of the artist and have little mainstream appeal, though postmortem compilations of unreleased materials from recently deceased artists have significant popularity.
- Box sets, elaborate multi-disc collections often covering the entire breadth of an artist's career or the full sweep of an entire record label or genre. Many anthologies are released in this format.
- Various artist themed compilations, e.g. love songs, Christmas songs, songs featuring a particular instrument (such as saxophone or piano), One Hit Wonders, and countless other variations. Original work by various artists for a single album or single, such as Phil Spector's A Christmas Gift For You or Band-Aid's Do They Know It's Christmas? (Feed The World) occasionally get erroneously mentioned as compilation albums or singles due to the fact that the songs are a compilation of various singers or musicians, however, they are original albums, not compilation albums.
- Various artist genre compilations, e.g. jazz, synthpop, rock, etc. These may be from the same time period (Year, decade or era, for example.), or may incorporate a common theme, as a soundtrack exemplifies well.
- Various artist hit compilations. This has been a very successful part of the album market since the early 1970s. Recent hit singles are gathered together in one place. In the 1970s, these were often single vinyl LPs with 10 to 12 tracks or more. In the 1980s, a double album with 6 or 8 tracks on each side became the norm. Now that CDs are the dominant format, these compilations are usually released on one, two, or three CDs.
- Promotional compilations or samplers. These are creative, successful forms of promotion for artists and/or record labels to promote their music. Generally, these types of releases are free or cost very little for the consumer or end listener. Elektra Records released the first sampler albums in the 1950s.
- Private label promotional compilations. Promotional compilation CDs can be private labeled for products, retail outlets, or commercial organizations or non-profit organizations. Artists and labels like to co-brand themselves with well-known brands for marketing purposes, and transversely well-known brands like to co-brand themselves with artists.
- Business-to-business promotional compilations. The music industry may use other types of promotional compilations within a business-to-business context to promote artists to media concerns (radio stations, music supervisors for TV, film or video games for synchronization)
- Composer/producer albums/record label. Many hip-hop producers will release a compilation album which features various artists, but with each track composed by the same producer or it is under the same Record Label.
For multi-artist compilations, royalties are usually pro-rated. In most cases, each artist's per-record royalty rate (typically 12–14% in 1999) is divided by the number of artists on the album. However, some record companies opt to simplify the equation and pay a rounded-off rate, either as a percentage or as a set amount, regardless of the total number of artists on the record. As of 1999 , these rates were around 1/2% to 1% or 15–16 cents per record. When a compilation album includes a track from a different record company, the royalties are split between the artist and the original record company.
In the United Kingdom, The Official Charts Company compiles a weekly compilation albums chart, limited to various artists compilations and soundtrack compilations.
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