Editing Soundtrack (section)

===Terminology===
[[MGM Records]] called these "original cast albums" in the style of [[Decca Broadway]] show cast albums mostly because the material on the discs would not lock to picture, thereby creating the largest distinction between 'Original ''Motion Picture'' Soundtrack' which, in its strictest sense would contain music that would lock to picture if the home user would play one alongside the other and 'Original ''Cast'' Soundtrack' which in its strictest sense would refer to studio recordings of film music by the original film cast, but which had been edited or rearranged for time and content and would not lock to picture.<ref name=Vulture />

In reality, however, soundtrack producers remain ambiguous about this distinction, and titles in which the music on the album ''does'' lock to picture may be labeled as OCS and music from an album that does ''not'' lock to picture may be referred to as OMPS.

The phrase "recorded directly from the soundtrack" was used for a while in the 1970s, 1980s and 1990s to differentiate material that would lock to picture from that which would not (excluding alternate masters and alternate vocals or solos). However, partly because many 'film takes' actually consisted of several different attempts at the song edited together, over time that term became nebulous as well. For example, in cases where the master take used in the film could not be found in its isolated form (without the M&E), the aforementioned alternate masters and alternate vocal and solo performances might be used instead.

As a result of all this ambiguity, over the years the term ''soundtrack'' began to be commonly applied to any recording from a film, whether taken from the actual film soundtrack or re-recorded in the studio at an earlier or later time. The term is also sometimes used for Broadway cast recordings.

Contributing to the vagueness of the term are projects such as ''[[The Sound of Music Live!]]'', which was filmed live on the set for an NBC holiday season special first broadcast in 2013. The ''album'', released three days before the broadcast, contained studio pre-recordings by the original cast of all the songs used in the special, but because only the orchestral portion of the material from the album is the same as that used in the special (i.e., the vocals were sung live over a prerecorded track), this creates a similar technicality. Although the ''instrumental music bed'' from the CD will lock to picture, the vocal performances will not (although it is possible to create a complete soundtrack recording by lifting the vocal performances from the DVD, erasing the alternate vocal masters from the CD and combining the two).

Among MGM's most notable soundtrack albums were those of the films ''[[Good News (1947 film)|Good News]]'', ''[[Easter Parade (film)|Easter Parade]]'', ''[[Annie Get Your Gun (film)|Annie Get Your Gun]]'', ''[[Singin' in the Rain]]'',<ref>{{cite web |title=Singin' In The Rain (1952) |url=https://the-numbers.com/movie/Singin-in-the-Rain|website=The Numbers | access-date=14 March 2022}}</ref> ''[[Show Boat (1951 film)|Show Boat]]'', ''[[The Band Wagon]]'', ''[[Seven Brides for Seven Brothers (film)|Seven Brides for Seven Brothers]]'', and ''[[Gigi (1958 film)|Gigi]]''.