In Depth: Charting the rise of high-definition digital music

The case of the missing soundHow high are your standards when it comes to audio? If you're an average person, the answer is not very. You probably listen to compressed music using cheap headphones in noisy environments like public transport – and think it sounds pretty great. But some people demand more. Audiophiles spend thousands every year on high-end equipment that delivers an experience as close as possible to having Beyoncé there in person belting out "ALL THE SINGLE LADIES.&qu