Forte di Quattro (포르테 디 콰트로) is a South Korean male vocal quartet formed by the competition show Phantom Singer in 2017.
[2] Forte di Quattro, also known as FDQ, was formed during the first season of the competition show Phantom Singer and they were the winning quartet.
[3] Kim Hyun-soo and Son Tae-jin were already acquainted as undergraduate voice students at Seoul National University's famed College of Music.
[4] Lee Byeo-ri, then working in the theater industry, is the only member without any formal training in singing but had experience as an amateur singer with various vocal groups.
[11] Compared to their debut album Classica was much more rooted in classical music and notably sampled melodies from the works of Rachmaninoff, Tchaikovsky and Bizet.