The melodic material for the duos comes from earlier settings I made for solo soprano, of three poems by the English author Sean Haldane. The movement titles are:

Echo (from the poem, If You Are Echo by Sean Haldane)
Blackbird (from the poem, The Blackbird in the Rain by Sean Haldane)
Berserk (from the poem, The Berserk Blackbird by Sean Haldane)

The duos were composed for Canadian horn virtuoso Olivia Esther.