The 'A' in their name�Akdong Musician�must also stand for 'accomplished' because the brother-sister duo have published their own 'music essay' book�'Raise Your Voice High!'

SEE ALSO: AKMU marks 10th anniversary of debut with heartfelt acts of kindness

According to publisher Mari Books, Akdong Musician wrote about their journey after winning 'K-Pop Star 2' and training for one year to make their debut. 'Raise Your Voice High!' reflects their thoughts and concerns on their identity and growth as musicians. Fans might also notice that the title is from the lyrics of their song "Crescendo".

'Raise Your Voice High!' will be available for pre-order online exclusively through Kyobo Book Centre starting on the 10th and will be released officially on the 18th.

You can also catch the siblings perform on 'M! Countdown' tonight so check back for that!