20 All-Time Great Recordings In One Great Package

This is a series, not a label. Only add this to the "Series" field, together with the actual label of the release. GP which stand for "Great Package" was created in 1968 and are specially priced double LP sets consisting of previously released material. Sealed LP's have an info sticker "2 Record Set - Special Low Price". In 1970 the series was altered and renamed "20 All-Time Great Recordings In A Deluxe 2-Record Set" and appears to be used only for this release "In A Deluxe 2-Record Set vs In One Great Package" Flatt & Scruggs - 20 All-Time Great Recordings In A Deluxe 2-Record Set