T-Series founder Gulshan Kumar soon played a key role in Bollywood's cassette boom of the late 1980s with his affordable T-Series albums. The biggest hit song from the album was ' Papa Kehte Hain', sung by Udit Narayan and picturised on Aamir Khan. The Qayamat Se Qayamat Tak soundtrack, composed by Anand–Milind and written by Majrooh Sultanpuri, became the best-selling Indian soundtrack album of 1988 and one of the best-selling Indian soundtrack albums of the 1980s, with more than 8 million units sold. The company's breakthrough came when it released the soundtrack for the 1988 Bollywood blockbuster Qayamat Se Qayamat Tak (also known as QSQT), directed by Mansoor Khan and starring Aamir Khan and Juhi Chawla. T-Series' first original film soundtrack release was for Lallu Ram in 1984, with music scored by Ravindra Jain. Later, he filmed major Hindu pilgrimages in India and sold them on VHS and video cassette tapes. Kumar noticed that many elderly Hindu followers could not read hymns and chants because of failing eyesight, so Kumar hired singers to record the chants and sold them as cheap cassettes. Kumar discovered that there was also a market for devotional music, and began recording and selling it. Krishan Kumar (left) and CEO Bhushan Kumar (right), the brother and son of Gulshan Kumar, respectively, during the audio release of Aashiqui 2 (2013) engaged in more straightforward copyright infringement in the form of pirate releases of popular hits, and it often illegally obtained film scores before the release of the film to ensure that its recordings were the first to hit the market. The company built its catalog through a variety of quasi-legal and illegal practices. T-Series was a profoundly disruptive force in the Indian music market, in large part because it was a tremendously successful pirate. Researchers Lawrence Liang and Ravi Sundaram wrote: 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.

6.1.2 Amitabh Bachchan Corporation Limited (acquired).

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 382.3 million subscribers as of 15 December 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 12 August 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 over 225 million subscribers and 201 billion total views as of 16 September 2022. 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 11 July 1983.

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