He studied vocals at the pop/jazz conservatory in Helsinki, briefly singing for an amateur cover band named Filthy Asses.

Stratovarius has then become a top name in the European heavy metal scene, recording seven more albums and performing in numerous notable rock festivals.

In late 2003, Kotipelto split from Stratovarius after intra-band disagreements, notably with guitarist Timo Tolkki.

Aside from Stratovarius and Kotipelto, Timo Kotipelto has also provided additional vocals to Sonata Arctica's Silence album along with lead vocals with his close friend, ex-Sonata Arctica guitarist Jani Liimatainen and his band Cain's Offering.

Kotipelto also provided vocals for the track "Eye of the Storm" on Warmen's 2009 album Japanese Hospitality.