I think this is a prevalent trend among Australian men, as well.
From Marc Cortez’s Everyday Theology blog (which also has a video grab):
Alistair Begg recently spoke at Western Seminary. And just before he got into his sermon, he went on a fascinating little digression about the fact that American men don’t sing during worship. It’s not just that we can’t sing, but that we don’t. And, although his primary focus is on worship, he thinks it’s a more widespread cultural phenomenon. In other cultures, especially in the UK, singing is a normal part of life. Men sing at football matches and in the pubs. So when they enter the church, singing is normal. But in America, it’s different. So Begg makes a fascinating point at the end of the clip when he says that he thinks you can really tell that American male has really been converted when he begins to sing during worship.
It used to be that a sure sign of conversion was loosening of the wallet, which is still true, but these days a loosening of the vocal chords is a marker of salvation as well.