Locations forming the backdrop to No Man's Land sweep across Europe and include Flanders, Passchendaele, Poland and Paris as well as landscapes in India and New Zealand.
Psathas says when musicians whose countries were once from different sides of war collaborate it is an unashamed commitment to optimism.
"The musicians are a metaphor for a much better way of engaging across cultures.
"What this work does is suggest a very basic idea. That if you were in a time machine where these people are fighting and you say 'guess what in 100 years time you will be playing music together' - they wouldn't have believed you."
Psathas says the international ensemble leaps musical genres and geographical borders.
And he wants to underscore the fact that the performance is not only classical but a snapshot of global music right now.
"We have folk music from India, Turkey and Morocco, to big rock sounds and everything including Syrian refugee rappers."
This is a once-in-a-lifetime event bringing audiences and musicians together for peace.
the fine print ¦What: No Man's Land ¦Where: Baycourt ¦When: March 8, 6pm - 7.15pm ¦Tickets: ph 0800 842538