Moderato (from Sonatine)

Moderato, from “Sonatine”, originally for flute and piano
Composed by Walter Gieseking
Arranged by Shoul Ben-Meir for Flute Choir; 6 C flutes (flute 2 doubles on piccolo), 2 Alto flutes, Bass flute, String Bass
Published by Megido Music Publications 

This innovative instrumentation of the Moderato begins with quarter note=86 and one sharp in the key signature, moving to six flats in the key; then to a section with no accidentals, then back to the original key.