As an idol rock band, CNBLUE deliver the best of both worlds, combining K-pop charisma and smooth vocals with legit instrumental chops. Their debut single, “Loner”, arrived in 2010 like a burst of fresh, funky energy to a Korean mainstream rock scene dominated by dramatic power ballads. Since then, they've continued to put out polished, dynamic dance-rock tracks with choruses that won't leave your head—though they occasionally drop a harder-hitting single (like 2013's “I'm Sorry”) or folk-inspired album cut to show off their versatility and musicianship.