Answer:
It depends on which key/instrument, but the basic tune for the piano is:
E E F G G F E D C C D E E D D
E E F G G F E D C C D E D C C
D D E C D EFE C D EFE D C D G (lower G)
E E E F G G F E D C C D E D C C (same as 2nd line, but extra E)
Alternate:
b b c' d' d' c' b a g g a b b a a
b b c' d' d' c' b a g g a b a g g
a a b g a b c' b g a b c' b a g a d
b b b c' d' d' c' b a g g a b a g g
(See the related questions for other instruments)