Backing vocalists sing with other singing background vocalists.
Factory  : machine-music -LRB- Завод  : музыка машин , Zavod  : muzyka mashin -RRB- , Op. 19 , commonly referred to as the Iron Foundry , is the most well-known work by Soviet composer Alexander Mosolov and a prime example of Soviet futurist music .. Alexander Mosolov. Alexander Mosolov. futurist music. futurism ( music ). It was composed between 1926 and 1927 as the first movement of the ballet suite Stal -LRB- `` Steel '' -RRB- .. The remaining movements of Steel , `` In Prison , '' `` At the Ball , '' and `` On the Square '' have been lost , and Iron Foundry is performed today as a standalone orchestral episode .