Hugely productive, Kalevi Aho has composed close to 30 concertos to date. These include works for traditional solo instruments - piano, violin, cello - but also more unusual ones, such as the theremin or accordion. One project of Aho's is to write concertos for all of the instruments of the symphony orchestra, from the flute to the contrabassoon, and in 2015 the turn came to the timpani. The work was commissioned by the Turku Philharmonic Orchestra for it's timpanist Ari-Pekka Mäenpää, and Mäenpää and Aho worked closely together during the writing process. The result is a concerto that explores the instrument's full potential, from the melody opening the concerto, which lasts more than thirty bars, to the rhythmically compelling third movement. Composed almost 30 years earlier, Piano Concerto No. 1 reflects the composer's interest at the time in numerology, and specifically in so-called cyclic numbers. The colorful and exciting work is however anything but cerebral. The soloist is Sonja Fräki, who chose Aho's music for piano as the subject of her doctoral studies, and whose recording of the solo works was released to great acclaim in 2015. With the two works on this album, no less than 16 concertos by Aho are available from BIS, in recordings that have been praised by reviewers worldwide, and received distinctions including the prestigious ECHO Klassik Award.