TromboneChat

I've been trying to source sheet music of a work for trombone quartet by Tadeusz Maklakiewicz, Chrysea Phorminx (1985), and have yet to have any luck. Below is a recording of this work featured on the Triton Trombone Quartet's 1996 album, 'Trombone Angels'



Any help would be much appreciated.

The publisher is listed as:

https://autorska-agencja.pl/en/

But the date of that company does not line up with when the piece was published.