He is a founder of famous Finnish folk music group Tsuumi Sound System. He also plays and composes for several other bands and groups in Finland and Nordic countries. Parallel to these activities Hannu has composed works for theatres, television and movies.

He´s music has been released all over the world in all kind of occasions from German brass-orchestra to Finnish puppet-animations!

At 2017 Hannu Kella was working as an artistic director of FIS nordic ski world championships 2017 held in Lahti. He was in charge of manuscript, producing and composing both opening and closing ceremonies of the championships.

2018-2019 He released new music with several groups. You can find Tsuumi Sound System: Blinking Light and Hannu Kella & Timo Alakotila: Mingled Years -albums from Spotify or Youtube music.

Currently he is working with several bands, theatres and solo projects in Finland and abroad.