The National Trade Union Congress began plans to start radio stations in April 1990, with the launch set for early 1991.
[2] Radio Heart began trial transmissions on 28 January 1991[3] and launched on 2 March by the then secretary-general of NTUC, Ong Teng Cheong.
[5] Radio Heart was operated by NTUC Voice Cooperative Society Limited,[6] which also owned "other communication and publication ventures", with studios located at the basement of Singapore Labour Foundation building at Thomson Road.
[7] On 15 July 1991, transmissions of Radio Heart's 91.3 and 100.3 were suspended for 32 hours due to problems with the transmitter at the SLF building in Thomson Road.
[8] In October 1992, Heart 91.3 revamped its programming to shed its "teeny-bopper" image and to appeal to a wider audience, with each programme having a specific theme and play a wide range of music from reggae to country.
[9] The Straits Times in 1993 described Radio Heart's programming which include lifestyle, fitness and health, current affairs, education and entertainment.
[16] By 1997, Heart 91.3 had an extensive playlist, ranging from "pop to alternative to classical" and multilingual programmes that feature English, Japanese, Thai and Chinese-dialect music.
[17] MediaWorks had the intention of buying radio stations from NTUC in March 2001, with the creation of a joint-venture between the two, taking over 91.3 and 100.3, then now known as Most Music and Heart FM respectively.