All three parts provide challenges: Clarinet 1 is the most melodic and is written primarily in the clarion register, reaching a high F in one song, but mostly presenting the melody in a comfortable range; Clarinet II generally works harmonies over the break and throat tones, although the range is the broadest in this part, occasionally dipping into the chalumeau register
and rising into the clarion register; Clarinet III is predominately written in the chalumeau register
and is responsible for laying down the bass line.
And Kriikku's delivery was so persuasive, little licks of ornamentation enlivening Mozart's autumnal score, his tone liquid and confiding, his chalumeau register
on this extended basset clarinet-type instrument dark and squirmingly cosy.