Ismo started co-operation with Lahti Big Band in 2011. The first concert with this 20-person-band was in May 2012 at Lahden Jazztori-festival. All the song are written by Ismo and arrangements are made by Erno Tiittanen. Erno is also the conductor of the band. The band has played at big festivals in Finland like Imatra Big Band Festival and Kotkan meripäivät.