164 (read Ichirokuyon, イチロクヨン), also known as Hiroshi (ひろし), is an acknowledged "VOCAROCK" producer. His name of his personal circle, the 203soundworks, is made up of his producer name of 164 plus the pronunciation of Miku's name (39, the character "mi" (ミ) is read as three and the character "ku" (ク) as nine Japanese), creating 203.
His debut work shiningray became a sudden hit when exceeding 100,000 views. His later works hold a stable view count, some of which have entered the Hall of Fame. He is most recognized for his song Amanojaku, which has received over 6 million views on Niconico.