According to Rediff, while Kumar "was involved in piracy, he was passionately market- and consumer-driven." The company also took advantage of loopholes in copyright law allowing for the release of cover versions of songs, which T-Series would then flood the market with. Back then, the Indian audio cassette market was small-scale, with widespread piracy, but there was growing demand for cassette music. The company initially sold pirated Bollywood songs, prior to releasing original music. T-Series was founded on 11 July 1983 by Gulshan Kumar, at the time a fruit juice seller in the Daryaganj neighbourhood of Delhi. T-Series also have other channels dedicated to content in several Indian languages including Bhojpuri, Punjabi, Tamil, Telugu, Malayalam, Kannada, Gujarati, Marathi and Rajasthani. The T-Series channel primarily features content in the Hindi language, and occasionally several other languages including Bhojpuri, Punjabi and English. It became the most-viewed YouTube channel in January 2017. The company's main T-Series channel on YouTube primarily shows music videos as well as film trailers.
The company's YouTube team consists of 13 people at the T-Series headquarters. On YouTube, T-Series has a multi-channel network, with 30 channels (including Lahari Music) that have over 360.9 million subscribers as of June 14, 2021. Since then, T-Series has been led by his son Bhushan Kumar and younger brother Krishan Kumar. However, Gulshan Kumar was murdered by the Mumbai mafia syndicate D-Company on August 12, 1997. They eventually became a leading music label with the release of Aashiqui (1990), composed by Nadeem–Shravan, which sold 20 million copies and became the best-selling Indian soundtrack album of all time. Their breakthrough came with the soundtrack for the 1988 Bollywood blockbuster Qayamat Se Qayamat Tak, composed by Anand-Milind, written by Majrooh Sultanpuri, and starring Aamir Khan and Juhi Chawla, which became one of the best-selling Indian music albums of the 1980s, with over 8 million sales. Kumar, initially a fruit juice seller in Delhi, founded T-Series to sell pirated Bollywood songs before the company eventually began producing new music. While best known as a music label, T-Series has also had some moderate success as a film production company.
T-Series also owns and operates the most-viewed and the most-subscribed YouTube channel, with 199 million subscribers and 171 billion total views as of November 22, 2021.
As of 2014, T-Series is India's largest music record label, with up to a 35% share of the Indian music market, followed by Sony Music India and Zee Music. It is primarily known for Bollywood music soundtracks and Indi-pop music. Super Cassettes Industries Private Limited, doing business as T-Series, is an Indian music record label and film production company founded by Gulshan Kumar on July 11, 1983.