Lassila was drummer, vocalist and co-founder of Stratovarius when they started in 1984 in Helsinki, Finland.



During the recording of "Dreamspace" (1994) Tuomo Lassila had a severe stress injury in his both hands and was not able to play drums for 8 weeks. The record had to be completed with Kingston Wall drummer Sami Kuoppamäki, who played on 4 tracks.



The music of early Stratovarius was very different from what it is today: very melodic and classically influenced. Back then it was heavily influenced by Black Sabbath and Ozzy Osbourne. It's one of the reasons that Tuomo Lassila, long time member, was asked to leave the band in 1995. He just could not play the material that was developing in Timo Tolkki's mind.



Tuomo Lassila was replaced by Jörg Michael.