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City of license Alton, Illinois
Broadcast area Greater St. Louis
Branding 100.3 The Sound
Slogan Modern Music For St. Louis
Frequency 100.3 MHz FM (HD Radio)
(also on HD Radio)

100.3-2 FM "100.3 The Beat"

Format Modern AC
ERP 50,000 watts
HAAT 150 meters
Class B
Facility ID 48958
Callsign meaning W S D D (The Sound)
Owner Clear Channel Communications
Sister stations KATZ, KLOU, KMJM-FM, KSD, KSLZ
Webcast Live

WSDD-FM, known as 100.3 The Sound, is a radio station serving the area of St. Louis, Missouri. with an Modern adult contemporary/Modern rock format. The Clear Channel Communications outlet broadcasts at 100.3 FM MHz with an ERP of 50 kW and is licensed to Alton, Illinois.


KATZ, which signed on in the late 1960s as WOKZ-FM, originally inherited the R&B format under the call letters WZEN, then later on its call letters from its AM sister in the mid 1980s. But under its original owners it was never successful and was always behind KMJM in terms of ratings and audience, which dates back to their days as rival Disco music outlets. After KMJM's owners bought KATZ and became its sister station in the 1990s they would go through a flux of formats, including Smooth Jazz and Adult R&B. But that all came to an end on April 1, 1999, when, after KATZ relocated from the AM position, it picked up the R&B/Hip-Hop format from the relocated KMJM-FM. For a while, it had performed successfully under Clear Channel ownership and had proven to be a good complement to Rhythmic-leaning Top 40 sister KSLZ. Its competitors were Urban station WHHL and current Urban AC stations KMJM-FM and WFUN-FM. KATZ-AM is now an Urban Gospel station.

KATZ-FM had picked up the Steve Harvey Morning Show, which is syndicated through Premiere Radio Networks, owned by KATZ-FM parent Clear Channel Communications on November 27, 2006. At first it seemed that KMJM should have gotten the show because it plays music on an Urban AC format due to Steve's history of not playing songs with "questionable" content - primarily rap. But KATZ was chosen because Clear Channel did not see it fit to replace Tony Scott who was doing AM drive at KMJM. At first it was odd, but KATZ was now among many Urban Hip Hop stations with a free pass to air the Black-adult aimed Steve Harvey Morning Show along with others such as KPRS in Kansas City, WKKV in Milwaukee, KDAY in Los Angeles, and WJHM in Orlando for example.

However, after recent changes in programming at the Clear Channel St. Louis cluster, the Steve Harvey Morning Show now runs on KMJM, with former morning host Tony Scott now being heard in PM Drive.

In September 2009, the station's rating started sliding. Clear Channel announced that they would end The Beat and go with a new format, although The Beat can still be heard on the station's secondary HD Radio subchannel. At 12PM local time on October 30, 2009, after playing Boyz II Men's End of the Road, KATZ-FM started stunting with Halloween music as "Halloween 100.3". On November 1, the station began stunting with Christmas music under the name "Christmas 100.3". Finally, at 12:01AM on December 26, 2009, 100.3 The Sound debuted with a Modern Adult Contemporary/Modern Rock hybrid format and new call letters "WSDD". The first song played on the new station was Owl City's Fireflies.

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