Katsumata Aiko (勝又亜依子) is a Japanese singer.
- Stage name: Heartbeat (ハービー), ahhco
- Birthday: November 5, 1985
- Birthplace: [[Nagoya], Japan
Katsumata Aiko was one of the two winners of the Chou Utahime Audition which are on the TV show ASAYAN in 2001. She made her debut as Katsumata Aiko on YOSHIMOTO R and C Co., Ltd. on January 23, 2002 with the single KEEP ON YOUR SIDE.
In 2004, she changed record labels to Universal Sigma and changed her name to ahhco before changing it again in 2010 (to Heartbeat).
- [2002.01.23] KEEP ON YOUR SIDE
- [2002.06.26] Respect
- [2003.06.25] I need you in my life
made in love(Cancelled)
- [2005.07.13] yes i do
- [2011.08.17] [Mou Ichido -Before You Walk Out of My Life']] (もう一度～Before you walk out of my life') / Jumpin'
- [2014.10.30] Paradise
- [2015.05.27] Unlock
- [xxxx.xx.xx] Jumpin'
- [xxxx.xx.xx] Mou Ichido -Before You Walk Out of My Life' (もう一度～Before you walk out of my life')