Real name: Tatsuya Iyama = 伊山達也

Tatsuya Iyama (born September 21, 1978) is a composer who first appeared in BEMANI in charge of several covers of licensed songs. Since then, his songs were primarily brought into the GuitarFreaks & DrumMania series from various KONAMI redemption games, such as SPIN FEVER, SPIN FEVER 2, and FORTUNE TRINITY. Afterwards, he started composing brand new songs for the GuitarFreaks & DrumMania series, and also for other BEMANI games, such as beatmania IIDX, pop'n music and REFLEC BEAT.

Tatsuya's music tends to follow a pop/piano tone with his Qrispy Joybox songs (with a couple of techno songs as well), and a more hardcore/rock sound with his MAX MAXIMIZER songs. He's also experimented with various other aliases in recent years. Since Daisuke Kurosawa's departure from KONAMI, Tatsuya has assisted as a guitarist/bassist under his TATSUYA aliases for several songs not composed by himself.

Tatsuya was for years a very active part of the REFLEC BEAT series, starting off as a sound designer in the first game, and becoming the sole sound director of the series from REFLEC BEAT limelight onwards up until REFLEC BEAT colette -All Seasons-, when he started to share sound directing duties with DJ TOTTO. He continued to serve as sound director until REFLEC BEAT groovin'!! Upper, when Des-ROW became the head sound director and producer. He was also the sound director of the BeatStream series.

Prior to joining KONAMI, Tatsuya had a duo named Moon Beams with Chie Nakamaru (mao), performing rhythm and blues songs.