They all vary from one to five disc compilations (occasionally six disc), starting in 1986 and continuing to the present day (Jan 2023). Initially, a special edition of a Now compilation was quite rare, and between 1994 and 2002, there weren't any released at all. From 2003, and until 2010, there was one special edition released each year, covering a decade (80s, 90s and 00s), or a cross section of big hits celebrating the Now series (Now Decades, Now Years, Now Dance) - however, from 2011, they became much more frequent, and in 2017, there were fifteen different titles released. The presentation of each release has evolved notably over time: from 1986 through to 2013, all double and triple CD sets were released in chubby Jewel cases which could hold up to 6 discs. From Now That's What I Call 30 Years, in 2013, all Special Editions were released as gatefold digipak sets (but rare 2-CD set were still issued in Jewel cases during this period). In 2019 and until the end of 2020, Now 100 Hits were all issued in glossy, gatefold "digifile" sleeves (similar to the digipak, but without plastic trays) where the CDs are pushed out from either side of each sleeve; from the 4 CD series sets starting in January 2021, gatefold cardboard sleeves are retained, but each CD is now stored in a slot cut into the card, known as a "wallet", which makes the CDs easier to remove than the previous design. Some of the Special Editions have identical names, although a few of these titles are followed by their year of release. In November 2018, the Now team took over the "100 Hits" brand from Demon Music Group, and in 2019 and 2020, the Special Editions series was effectively rested while 24 different Now 100 Hits compilations were issued in very quick succession, until the end of November 2020. From January 2021, the Special Editions series resumed, albeit with reduced output due to the introduction of two new series; Now Yearbook and the 4-CD series, with these three release variations, along with the reissues of the original Now That's What I Call Music series (up to Now 12 by July 2022) continue to the present day (July 2022). Now That's What I Call Music – The Summer Album (6 July 1986) Double-LP/MC only Now That's What I Call Music '86 (27 October 1986)