By Jonah Engel Bromwich

May 3, 2018

Luke Pritchard and Jonny Laxton were 13 when they met at a boarding school in Crowthorne, England, in 2011. They bonded over a shared love of underground music and in 2014 started a YouTube channel, College Music, to promote the artists they liked.

At first, the channel grew slowly. Then, in the spring of 2016, Mr. Pritchard discovered 24/7 live-streaming, a feature that allows YouTube's users to broadcast a single video continuously.

College Music had 794 subscribers in April 2015, a year before Mr. Pritchard and Mr. Laxton started streaming. A month after they began, they had more than 18,440. In April 2016, they had 98,110 subscribers and as of last month, with three active live streams, they have more than triple that amount, with 334,000. They make about $5,000 a month from the streams.

The boys stumbled upon a new strategy, one that, in the past two years, has helped a certain kind of YouTube channel achieve widespread popularity. Hundreds of independently run channels have begun to stream music nonstop, with videos that combine playlists with hundreds of songs and short, looped animations, often taken from anime films without copyright permission.