National Anthem: Phleng Chaat
("Phleng": song, "Chaat": country)
In Thailand, the national anthem is played in public places, on TV or radio at 8:00 o'clock in the morning and 6:00 o'clock in the evening.
If you hear this song in Thailand, stand still until the song finishes. You don't need to be bewildered (I was at first). Just do as people do.