Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
The Sound of the Jam is a compilation album and the fifth greatest hits album by the group The Jam, released to mark their twenty-fifth anniversary. It contains a remixed version of 'That's Entertainment', featuring only the guitars and vocals of the demo version; and without the bass, drums and percussion.
As well as the standard 1-CD edition there is also a 2-CD+DVD edition which includes a DVD of 11 of the Jam's music videos (all of which and more would be included on the following year's The Complete Jam on Film DVD).