Korean popular music, also known as K-pop, has gained a worldwide following – not only among fans, but also the aspiring musicians hoping for a chance to shine on stage. Every year, thousands of young people apply to the Acopia school in the South Korean capital Seoul, for one of about 500 places in the programme that offers training including preparation for auditions with record labels searching for the next K-pop sensations. Students spend about US$3,000 a month for tuition, room and board…