So is the fifth studio album (and seventh album overall) and first non eponymous studio album by British rock musician Peter Gabriel, released in 1986. Many of its songs reflect a more conventional pop-writing style and became radio hits, while others still retain Gabriel's dark, brooding sense of experimentalism.

It is Peter Gabriel's second album produced by Canadian artist Daniel Lanois. The previous year, the two of them had worked together on Birdy. Lanois had been previously known for his ambient collaborations with Brian Eno as well as producing U2 since 1984. As he had with the soundtrack to the film Birdy, Lanois brought many of his own ambient sensibilities to this recording.

So is the best-selling album of Gabriel's career and charted at number 1 in the UK Album Chart, and number 2 on the Billboard 200 in the US. It is certified triple platinum in the UK, and five times platinum in the US. So ranked at number #14 on Rolling Stone magazine's list of "Top 100 Albums of the Eighties" and is included in 1001 Albums You Must Hear Before You Die.

An album may be understood as a collection of recordings, released as a single package on gramophone record, cassette, compact disc, or via digital distribution, however the concept is found in printed music dating into the early nineteenth century in works by composers such as Schumann and Mendelssohn. The word derives from the Latin word for list.

Today, with the vinyl record no longer being used as the primary form of distribution, the term "album" can still be applied to any sound recording collection, such as those on compact disc, MiniDisc, Compact audio cassette, and digital or MP3 albums.Cover art is also considered an integral part of the album. Many albums also come with liner notes and inserts giving background information or analysis of the recording, reprinted lyrics, images of the performers, or additional artwork and text. These are now often found in the form of CD booklets.

Vinyl LP records have two sides, each comprising one half of the album. If a pop or rock album contained tracks released separately as commercial singles, these were often traditionally placed in particular positions on the album. A common configuration was to have the album led off by the second and third singles, followed by a ballad. The first single would lead off side 2. In the past many singles (such as the Beatles' "Hey Jude" and Bob Dylan's "Positively 4th Street") did not appear on albums, but others (such as the Beatles' "Come Together" and Dylan's "Like a Rolling Stone") were part of an album released concurrently. Today, many commercial albums of music tracks feature one or more singles, which are released separately to radio, TV or the Internet as a way of promoting the album. Albums have also been issued that are compilations of older tracks not originally released together, such as singles not originally found on albums, b-sides of singles, or unfinished "demo" recordings.