At the age of 9 Jukka Harju found the horn and two years later he performed Mozart's Horn Concerto in Eb KV447 at a concert in Dublin broadcasted for TV by European radio stations. By winning the Lieksa International Horn Competition 2005 he was nominated as a Brass player of the year 2006 in Finland.
The blitz start went on to the studies in the Sibelius-Academy in Helsinki with Kalervo Kulmala and later in Vienna University for Music and Performing Arts with Roland Berger, principal horn of Vienna Philharmonic Orchestra. On 2008 Harju settled on the leading chair of the horn group in the Finnish Radio Symphony Orchestra. Before that he was a member of Tampere Filharmonia and Helsinki Philharmonic Orchestra. On the side he has appeared as a guest principal horn in l'Orchestre Philharmonique de Radio France, Swedish Radio Symphony Orchestra, Royal Stockholm Philharmonic Orchestra, Oslo Philharmonic Orchestra, Bamberger Symphoniker, Chamber Orchestra of Europe and Comics Oper Berlin.
As a horn soloist Harju has performed more than 50 concerts, among others with FRSO, Helsinki Philharmonic Orchestra, Lahti Sinfonia, Tapiola Sinfonietta, Ostrobotnian Chamber Orchestra, Tallinn Chamber Orchestra, Dala Sinfonietta, Haydn Orchestra Bolzano etc. Classical and romantic era solo concertos are on his main focus, but Harju is familiar with fresher and more rare works too. In a role of a chamber musician, recitalist and teacher Harju has act in Italy, Germany, Lithuania, Sweden, Norway and Iceland - and even further in China, Japan and United States. When not playing, Harju's time is devoted to his family, compositions, arrangements and work as a freelancer director.