Try singing Frère Jacques as a round by singing along with this video. Sing along with the singer on the left in the pink sweatshirt each time. She will start at a different time each time they sing the song.
Just watch and listen the first time.
Here are the words:
Frère Jacques, Frère Jacques
Dormez vous, dormez vous?
Sonnez les matines, sonnez les matines,
Din din don! Din din don!