Of all the songs, this is still the most poignant of anything from that dreadful day in 2001.  We Will Never Forget...Watch and listen to Alan Jackson sing 'Where Were You When The World Stopped Turning' as it was sung on the CMA Awards Show...

Here is Darryl Worley singing 'Have You Forgotten'

There is also a September 11th digital archive that is very good to watch.