Bing Crosby found it "really difficult" to perform 'White Christmas' to the troops during World War II.
The late crooner - who passed away in 1977 at the age of 74 - achieved the highest-selling single of all time with the festive classic but his nephew Howard Crosby has revealed how his uncle once performed it in an open-air field in France in 1944 for thousands of soldiers and struggled to get through it.
