The iPod wasn't the first MP3 player. Nor were the iPhone and iPad the first in their categories. The real reason for the success of these devices - the true unsung hero at Apple - is the iTunes software and iTunes Store. Because Apple provided them, it wasn't just selling hardware.

The men and women who work in our prisons are the unsung heroes of the criminal justice system.

I've always seen first responders as unsung heroes and very special people because, when everyone else is running away from danger, they run into it.

The 1986 tax act is sort of the unsung hero of the very good economic times we had for a long time. Of course, politics gums it all up again and preferences get put in.

I think when you get into your 30s, you start to realize all of the patterns you have in your life and all of the stuff that you're avoiding. It's a terribly unsung period in people's lives. I can't think about many artists who have sung about it, because it's so not sexy.

My associate director, Lisa Leguillou, is remarkable: flying around, visiting all the companies. She is truly the unsung hero of 'Wicked'. She has been by my side from day one, and she is invaluable. I frankly don't know how she does it.