BTS leads K-pop's charge into the US music business.

The South Korean music industry is one of the biggest in Asia, and its stars even cross over to fame in other markets.

The boy band BTS has won great praise in its home country, and its success shows no signs of stopping.

Made up of seven young singers, BTS has shot to fame since it first started making music in 2013.

It has already become South Korea's biggest pop group. BTS's record label thought the band could do more than just top the charts at home and sought to promote it in the US as well.

The effort paid off, and the band rose to the top of the US charts.

It has become one of the most successful bands in US music history, releasing number one albums at a rate not seen since the Beatles.

It was invited to perform at the 2020 Grammy Awards ceremony, another sign of its rise to music stardom. Stardom, of course, comes with fans, and BTS certainly has a lot of them.

The band's fans, referred to as the ARMY, are numerous and enthusiastic.

They're highly active on social media and can be found promoting their beloved band at every opportunity.

Some people find such large and committed fan groups intimidating and unfriendly to those outside it, but there are those within the ARMY who try hard to welcome newcomers into its ranks. Another thing setting BTS apart from other bands is the sophistication of thought that goes into its music.

BTS songs often contain references to famous works of art, philosophy, and literature.

Behind the fun songs and dances, there are deep layers of meaning.

This is another thing that may explain the band's massive popularity.