DWLS (97.1 FM), broadcasting as Barangay LS 97.1, is a radio station owned and operated by GMA Network. It serves as the flagship station of Barangay FM. The station's studio is located at the GMA Network Annex Building, EDSA cor. GMA Network Dr., Diliman, Quezon City, and its transmitter is located at GMA Tower of Power, Brgy. Culiat, Tandang Sora, Quezon City. Barangay LS was recognized as the #1 FM radio station in Metro Manila, according to the Nielsen Radio Audience Measurement survey conducted in the month of May 2017. History 1955–1986: DZXX/DWXX It first aired in June 1955, when "Uncle Bob" Stewart opened DZXX-AM 890 kHz station under the control of the Republic Broadcasting System (RBS). DZXX made history as the first pop music station in the country using the AM format, playing both local and international pop music of that era. In 1972, DZXX temporarily shut down due to Martial Law, later it was revived under the label DZXX/DWXX 1000 (Double X) when Hypersonic Broadcasting Corporation owned this station. In 1978, its frequency changed to 1026 kHz (based on GE75). In 1986, NBC acquired and renamed its station to DZAM-AM. 1976–1992: WLS FM/The Giant In July 1976, GMA launched its third radio station 97.1 WLS FM as an adult standards and jazz station. In 1981, at the height of popularity of pop music, it switched to Adult Top 40 format, with the slogan The Best Music. It was known for playing hourly Beatles music every weekday early mornings, which was later on adopted by 100.3 RJFM. In November 1988, upon the completion of GMA's Tower of Power, WLS earned the brand, The Giant 97.1 WLS FM. 1992–2007: Campus Radio When GMA was renamed as the "Rainbow Satellite Network" in early 1992, the station was reformatted on April 30, 1992, as Campus Radio 97.1 WLS FM, with a Top 40 format. This was to target teens & early adults. Its notable programs were the longest-running program on the station, the legendary "Top 20 at 12" (anchored by Milo Cavarlez, a.k.a. "The Triggerman," which was first heard on Kiss FM 101.1 (now 101.1 Yes The Best), where the top 20 songs of the day were counted down in the mold of BBC Radio 1's The Official Chart Show at noontime, and "Campus Aircheck", an institution of sorts for aspiring DJs to get hired by Campus Radio, touted as "the first