For many years I have been thinking of a way to use quarter tones in my music. We don´t usually play them because they do not belong to the chromatic scale.

I have used these notes in other pieces, as in the concerto Blue Phrases for Trumpet, Brass Band and live electronics (from 2006).

In this concerto, the soloist has to play quarter tones as a melodic element and some of the brass band parts also contains them.

The tension in the chords I then get, gives my musical language a new di...