He studied composition at the Sibelius Academy in Helsinki under the guidance of Erkki Jokinen and received his diploma in composition in 2004. He has also attended composition masterclasses led by Michael Jarrel, Magnus Lindberg and Ivan Fedele. Currently Fagerlund works as a freelance composer based in Helsinki.
His music has been described as flowing, fast-moving and rich in sound. The fast flow and rhythmic elasticity are often offset by fragile and lyrically sensitive episodes, and the shift between mobility and immobility is in fact one of the salient features of Fagerlund’s music. A highly virtuosic instrumental feel and a strong sense of musicianship is manifested in all his works, creating musical dramas in which powerful expression is combined with intensity and communicativeness.
Fagerlund's music has been performed at several major music events around the world. His main oeuvre has always been the orchestra: his Clarinet Concerto was a roaring success and it has been performed several times since the premiere in 2006; the orchestral work Isola, commissioned by Korsholm Music Festival, was premiered in 2007 and has since then been on the repertoire of several orchestras. Fagerlund`s list of works includes also vocal, choral, chamber, and solo music. Upcoming orchestral works include a Violin Concerto for violinist Pekka Kuusisto commissioned by the Tampere Philharmonic Orchestra (premiere 2012) and a Concerto for Guitar and Symphony Orchestra commissioned by The Finnish Radio Symphony Orchestra (premiere 2013).
In 2011 Fagerlund was awarded Finland's most renowned music prize, the Teosto Prize, for his orchestral work Ignite. The same year Ignite was also selected as a recommended work at the International Rostrum of Composers 2011 in Vienna.
Recordings of Fagerlund's music are available on the Record label BIS.