I wonder how many teams still do it? I know the Rangers still do it.
I don't recall them ever doing it at the K, certainly not with any regularity. It's always been "Take Me Out To The Ballgame" at the middle of the seventh and another fan sing-along in the middle of the sixth. That one used to be "Friends in Low Places" but was replaced with "Don't Stop Belivin'". Appropriate given the last two years.
The Blue Jays don’t at least on a regular basis. For their 7th its their theme/fight song OK Blue Jays and then Take me out to the Ballgame. As far as patriotic maybe the Maple Leaf Forever but I have never heard that sung.