HAL, also known as shuraba-P (修羅場P), is a composer most notable for his song "Harvest" sung by Kagamine Rin. Harvest was his most notable work and his first to enter the Hall of fame (exceeding 100,000 views). He mostly uses Rin in his works, and also uses UTAU more often than than VOCALOIDs in original songs, such as Namine Ritsu and Kasane Teto.
Other notable works from HAL includes "Cynical Romance" sung by Kagamine Rin and Len, and "Marionet" by Kagamine Rin.
HAL has also written voice synthesis engines, namely v.Connect-STAND for Cadencii and lesynth for QTau.