Band's bus crashed in Colorado on April 17
George Lewis Jr played with his hand in a cast after undergoing reconstructive surgery
Andy Bauer remains confident of full recovery following surgery on his spine
Incident in Aurora has left frontman George Lewis Jr requiring hand surgery
Up to 12 people taken to hospital following multi-vehicle incident
Song is first to be heard from 2015 album 'Eclipse'
Singer confirms new album will be released in October
Friends singer Samantha Urbani also features on the track
Singer promised 'a gem from the depths of my father's life and a stone from the recent corners of mine'