In the US, we usually sing Frere Jacques in French. Here's an English version because sometimes people sing it in French first and then English. Occasionally you'll hear it in English only.

Are You Sleeping? (Brother John) - American Children's Songs - The USA - Mama Lisa's World: Children's Songs and Rhymes from Around the World  - Intro Image
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Many thanks to Girl Scout Troop 1890 for singing this song for Mama Lisa's World in 2011.