This is the first song (kind of) that
children learn in the
Yamaha Music School curriculum.
In 4/4 time, sung in solfege, it's: "Mi re do (rest) mi re do (rest) do do re re mi re do (rest)" where "mi" corresponds to E, "re" to D, and "do" to C.
This remains one of a very few piano songs that I can confidently play, after nine years of childhood lessons. But I'll be damned if I ever forget it.