Pink Floyd’s David Gilmour and Nick Mason, along with touring bassist Guy Pratt and keyboardist Nitin Sawhney, have reunited for their “first newly conceived single as a band” in 28 years.

“Hey Hey Rise Up” features vocals from Andriy Khlyvnyuk of Ukrainian band Boombox.

Andriy Khlyvnyuk had originally performed an a capella version of a 1914 Ukrainian anthem (“Oh, the Red Viburnum in the Meadow”) on Instagram, which inspired the collaboration.

All proceeds from the new single go towards Ukraine Humanitarian Relief.