SLS Top 40
This dance music chart is published every Saturday. The first SLS chart (a disco chart) was published in 1981. Initially, the chart was not published regularly and the number of positions varied between 15 and 40. The first regular SLS TOP 40 was introduced in Amsterdam, Netherlands, in 1984. Originally, it was an import dance chart. At that time (1984-1990), the rankings in our chart were based on playlists of illegal radio stations like Radio Decibel, Radio Sjuul, and W.A.P.S., the Ferry Maat Soul Show on Radio 3 (the Dutch national music radio station), and record sales at import record stores such as Attalos, Rhythm Import, and Boudisque in Amsterdam. Over the years, urban and dance/house music have become more mainstream. Nowadays, our chart is based on dance tracks from various sources, including music charts, DJ playlists, streaming services, and digital music stores, from all over the world. All the charts from past and current years are available in our archive section. The current Top 40 is also available as a playlist on Spotify. Additionally, we offer exclusive Spotify playlists for the SLS Nu Disco Dance Chart and the SLS Club Chart. The end-of-year countdown playlists are also available on Spotify (see the links on the Home page and the Spotify section)

SLS Radio
Since 2003, SLS has presented its own live-stream. The live-stream features the best dance classics from the 70s to the present, alongside the latest in urban and club music, 24/7. (See the links on the homepage).

SLS Top 40 Archive
To inform you about the history of dance music, we are working on a complete SLS Top 40 archive. In our archive, we have charts from 1984 to the present. Because the SLS Top 40 started in 1984, we have used other sources for the previous years:

Year	Source	SLS
1975 (week 1) - 1984 (week 52)	Billboard's Hot Dance/Disco Chart Billboard's Top RnB/Hip Hop Chart Dutch Top 40/Tipparade Dutch Dance Top 50 SLS Disco Chart Attalos Top 50	Top 40
1984 (week 1) - Current week	SLS	Top 40

End-of-year Archive
At the end of every year we look back with the end-of-year-chart. This list is based on the published SLS TOP 40's in that year. Each week the number one position gets 40 points, the number two 39 and so on till' the number 40 position who gets only one point. The total of these points determine the position in the end-of-year-chart. The end-of year charts and their sources :

Years	Source	SLS
1970 - 1978	Dutch Top 40 / Billboard	Top 50
1979 - 1982	Dutch Top 40 / Billboard	Top 100
1983 - now	SLS	Top 100

All-time Archive
The total results from all the official years of the SLS Top 40 can be found in the All-Time Top 100. However, comparing hits over the years has proven difficult, so we stopped publishing this list in 2009.