Formed in 2010, the production duo Duble Sidekick has risen to prominence in the K-pop world through a mix of high-energy, retro-inspired electro-pop like KARA's “Mamma Mia” and mellow R&B tunes like Song Ji Eun's “Twenty-Five” and K.Will's “You Don't Know Love.” Their specialties are shimmering synths and irresistibly bouncy rhythms that can make you nod your head at any tempo.