[1][2][3] Söderblom was born in Turku, the son of Arne Paulinus Soderblom and Gerda Mathilda Rajalin.
He studied at the Åbo Akademi University in Turku with Otto Andersson from 1950 to 1952 and at the Vienna Music Academy with Hans Swarowsky from 1954 to 1957.
He was also instrumental in the revival of the Savonlinna Opera Festival in 1967 after 50 years of dormancy.
The re-opening was celebrated with Söderblom conducting Beethoven's Fidelio in the Olavinlinna castle.
In addition to the above staged performances, Söderblom also conducted the world premiere recording of Aarre Merikanto's Juha in 1972.