Gleb is among a 140-strong group of talented young musicians and their families who have been evacuated out of Ukraine into Slovenia.
A recorder was one of the only belongings that the 10-year-old took with him when he fled his home amid the conflict.
Some of his fellow musicians have formed a new youth orchestra in exile, under the direction of Slovenia’s top female conductor.
Together, they hope to become musical ambassadors for Ukraine.
The BBC’s Caroline Hawley reports.
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