There was a strike - singers, songwriters, studio people, and heavens knows what else (I wasn't there). Music was laid on hold. Copyright law was being checked for people "re-doing" music that did not belong to them.
Freddy Martin was a popular orchestra leader and a fine tenor-sax man. He had a lot of people dependent on him for gigs. He always liked a classical piece done by Tchaikovsky that was in the public domain so he worked an arrangement with it and got it recorded in 1941 -
Tonight We Love but it's still Tchaikovsky's B-Flat Piano Concerto. This 78RPM record ( I have one) sold a million copies.
http://www.youtube.com/watch?v=ZhZvbC8j4EM