In the 1940's, all the young girls crowded the stage and fainted over a popular singer, just like they did in later eras over Elvis Presley, The Beetles, and now modern singers. Who was it then?
The most popular male singer of the 1940s in America was Frank Sinatra, who lost popularity in the 50s, but came back into the spotlight for acting in 1954 after winning an Academy Award for Best Supporting Role. Though, his popularity as a singer had declined and was geared more towards the "mature" crowd after that.