Born in 1973 in Vaasa, Finland, Kai Hahto is most known for his drumming in Rotten Sound and Wintersun, the band led by former Ensiferum singer Jari Mäenpää. Over the years Kai Hahto has earned a status as an extremely well-rounded musician and a respected teacher.
Kai Hahto plays drums in Wintersun. The group's self-titled debut album was released in September 2004 through Nuclear Blast Records. The band's music has been described as a mix between early Amorphis, Children Of Bodom, Finntroll and Ensiferum.
Kai Hahto parted ways with Rotten Sound in February 2006 in order to concentrate more on his family and his other band Wintersun. Hahto's replacement was Sami Latva of Deathbound fame.