Arlonsy or more known as Oncy is an ideal figure of a musician. Besides his superb skills in guitar playing, he is also well known for his works with Ungu. Oncy joined Ungu in 2003, where previously he was known as one of the guitarists in Funky Kopral. Public knows him as an energetic guitarist with good musicality. Oncy is a natural type of songwriter. He wrote songs honestly, according to what he felt. He also has a huge musical influences. He listened to anykind of song, anykind of music genre. That what's makes him becomes the man behind most of Ungu's greatest hits, such as Saat Indah Bersamamu, Dilema Cinta, Ciuman Pertama, Seperti Bintang and many more.