In the late 60s I sang with the Dallas Civic Chorus. We always sang the opening national anthem at the Dallas Cowboys games. They were then in the old Cotton Bowl at Southern Methodist University in Dallas. Since the acoustics for singing in a stadium are so bad, we lip-synced it to a recording of our singing. For this we got free seats at the game. Sometimes a non-singing friend would come along to get a free seat - they just had to move their lips at the right time. Once our director had to quickly jump up on the podium as the tape was queued a bit too early. It always amused me when a friend would tell me the next day, how good we sounded.

Cheers, S. in Seattle