Harri Lidsle has been with the Lahti Symphony Orchestra since 1990. He spent the period 2004-06 on leave of absence as a freelance musician and teacher in Ostrobothnia, during which time he formed the Ostrobothnia Brass Band, the Seven Bridges Sinfonietta and FCTuba. 

As a soloist he has appeared with orchestras in Finland, Armenia, Australia, Iceland, Germany and Estonia, and with a pianist he has toured widely in Europe, the USA and Canada. His tour of Northern Finland with the Chamber Orchestra of Lapland took in some 60 concerts and he has given nearly 300 duo recitals. His regular chamber music partners are Kyoko Matsukawa, Outi Nissi and Tarmo Järvilehto, piano and Olli-Pekka Martikainen, percussion.
 
Lidsle is known abroad above all for his partnerships with composers. He has commissioned or premiered over 20 works, including concertos by Kalevi Aho, Harri Ahmas, Jan Sandström, Askell Masson, Alexander Arutunian, Patrik Vidjeskog, Markus Fagerudd and Harri Wessman, and a dozen or so composers from several countries have supplied him with smaller-scale works. 

Lidsle is also extremely well-known as a masterclass teacher and competition jury member in both Finnish and international arenas. He has acted as an advisor to the International Tuba Euphonium Association, coordinated the 2001 International Tuba Euphonium Conference held in Lahti, Finland, and developed instruments with various instrument builders. 

In 1997 he was elected the Finnish Brass Player of the Year by Lieksa Brass Week.