"They can also do musical therapy, starting to play music again and by doing this gaining some quality of life, " he says.

BBC: How can musicians keep playing despite amnesia?

Playing DVDs of her favorite musical group while on the road "is a form of therapy for me, " says Ms. Hirata, a fan of a popular Japanese boy band called Arashi.

WSJ: In Japan, Television Viewing Doesn't Have to Take a Back Seat