ThE ITsy BItsy Spider is a nursery rhyme with no known author or original source, it appears to have first been published in 1910 in the book "camp camino and lower california".
The Itsy Bitsy Spider:
The itsy bitsy spider Climbed up the waterspout; Down came the rain And washed the spider out; Out came the sun And dried up all the rain; And the itsy bitsy spider Climbed up the spout again.