Of all the churches in Finland, only Kallio Church has both Baroque-style and French Romantic-style organs. 

The church’s original organ, built by the German organ builders Schlag & Söhne, was placed behind the altar. It did not function reliably, and after various unsuccessful repairs and modifications, the church finally received a proper instrument in 1987: a 19-stop organ built by the Kangasala Organ Factory, located at the front of the church, representing the North German Baroque tradition. 

It was not until 1995 that the church received a large instrument worthy of its status — the main organ, with 48 stops, built by the Swedish company Åkerman & Lund. This was the first organ in Finland to represent the French Romantic style. 

Both instruments are highly successful examples of their respective stylistic traditions. As a result, the church is both a popular concert venue and an important place for teaching and practice for organ students from the Sibelius Academy of the University of the Arts Helsinki.