At the Wonder Girls 1st Concert on the 28th, 2AM sang their newest song, "A Friend's Confession," but due to technical difficulties, they were forced to sing the song without any music. That wasn't a problem for the boys though, as they sang their song just beautifully. They received much applause, as well as recognition, for their outstanding and unexpected acapella performance. 2AM also performed "This Song," from their last album and g.o.d's "One Candle." When asked what they thought of the incident, 2AM laughed it off and said, "Since it wasn't our own concert, we didn't feel burdened/intimidated, so we were surprised when the music all of a sudden didn't work." The music came back on during the middle of the performance, but with or without the music, their voices were amazing. Congratulations 2AM, for being one of the groups out there that can actually sing. video credit: joongbolove **UPDATE** A video of the acapella performance again, directly uploaded from 2am's official youtube site: