Row, Row, Row Your Boat
(Can be sung as a 4-part round)

Row, row, row your boat
Gently down the stream
Merrily, merrily, merrily, merrily
Life is but a dream

There is a second, silly version of this song:

Row, row, row your boat
Underneath the stream,
Ha, ha, fooled you,
I'm a submarine!

Thanks to Heather Smith, who emailed me this silly version!

Row, row, row your boat
Gently down the stream
If you meet a crocodile,
Don't forget to scream!

Thanks to Jo Ellen, who sent me this "proper English version" of the song.
Propel, propel, propel your craft
Down the liquid solution
Ecstatic, ecstatic, ecstatic,ecstatic
Life is but an illusion