Born in Gothenburg, Sweden, Kjellberg originally pursued a degree in industrial economics and technology management at Chalmers University of Technology in Gothenburg. In 2010, during his time at the university, he registered a YouTube account under the name PewDiePie. The following year, he dropped out of Chalmers after losing interest in his degree field, much to the dismay of his parents. After failing to earn an apprenticeship with an advertising agency in Scandinavia, he then decided to focus on creating content for his YouTube channel. In order to fund his videos, Kjellberg began selling prints of his Photoshop art projects and worked at a hot dog stand. Kjellberg soon gathered a rapidly increasing online following, and in July 2012, his channel surpassed one million subscribers. On 15 August 2013, Kjellberg became the most-subscribed user on YouTube, being briefly surpassed in late 2013 by YouTube Spotlight. After regaining the top position on 23 December 2013 the channel has now amassed over 86 million subscribers as of February 2019. From 29 December 2014 to 14 February 2017, Kjellberg's channel was the most-viewed YouTube channel. As of February 2019, the channel has received over 20 billion video views, ranking as the 8th-most viewed on the platform.
https://en.wikipedia.org/wiki/PewDiePie
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Kumar, initially a fruit juice seller in Delhi, founded T-Series to sell pirated Bollywood songs, before the company eventually began producing new music. 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. 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. However, Gulshan Kumar was murdered by the Mumbai mafia syndicate D-Company in 1997. Since then, T-Series has been led by his son Bhushan Kumar and younger brother Krishan Kumar. On YouTube, T-Series has a multi-channel network, with 29 channels that have more than 140 million subscribers as of January 2019. The company's YouTube team consists of 13 people at the T-Series headquarters. The company's main T-Series channel on YouTube primarily shows music videos as well as film trailers. In January 2017, it became the most-viewed YouTube channel,with 61.5 billion views as of 10 February 2019. With over 85 million subscribers as of 11 February 2019, it also ranks as the second most-subscribed channel behind PewDiePie. The T-Series channel primarily features content in the Hindi language, in addition to Urdu and Punjabi language content, while they have other channels that also feature content in other Indian languages such as Tamil, Telugu and Sanskrit.
https://en.wikipedia.org/wiki/T-Series_(company)