From 1990 to 1992, Time-Life released Vols. 1-20 of the label series.
Time-Life introduced the Solid Gold Soul series in 1996. Throughout 1996 and 1997, Time-Life repackaged 17 of the first 20 volumes of label series as releases in the Solid Gold Soul series. The Solid Gold Soul releases included updated artwork and packaging, but the used same track listings, masterings, and (usually) the same matrix number on the disc.
In 1996, Time-Life released the yearly collections for 1973, 1974, 1975, and 1976 simultaneously in the label series (as Vols. 21-24) and the Solid Gold Soul series (as Vols. 8-11).
There were no further releases for the label series beyond Vol. 24 in 1996. The Solid Gold Soul series continued with new releases until about 2001.