This is an e-mail I just received. It's just three girls, it can't be all that hard.
Subject: Ross Sisters
A video of 1944, was retrieved, scanned and colored. In this classic choreography from the movie "Broadway Rhythm", the Ross Sisters, Aggie, Maggie and Elmira , sing and move in a way that does not seem humanly possible.
During the first 50 seconds, they are singing, but NEXT , WATCH what they are doing, it's almost impossible....