I bought this single called 'Who Will Stop the Rain" by Montage back in tthe eighties but never heard anything else about them. The b-side is called 'If I Only Had Money'. A quick search on the Internet reveals that their record company Reekus Records in back in operation, and there's even a video of them performing another song on TV, called when I close my eyes. There's a discography on irishrock.org
Pity that there's no sign of 'Who Will Stop the Rain' on the net. I'll keep searching.