'K-pop Star 2' contestants Akdong Musician have become the 'nation's little brother-sister duo' by achieving another instant hit with their latest self-composed song�"Crescendo".

"Crescendo" landed at the top of Soribada's weekly chart for the second straight week in March, overcoming hot comebacks from Girl's Day, Jung In, and more.�Their previous hits "Don't Cross Your Legs" and "You're Charming" have also previously ranked #1 on�music charts.�Taeyeon's "And One" for the 'Wind Blows In Winter' OST trailed behind in 2nd place.

A Soribada representative stated, "It's a rare feat for audition show contestants to rank #1 with their own song."

Congrats to Akdong Musician! Check out the duo perform "Crescendo" live below.