The word "high" in the phrase "On a high hill" is sung to the highest pitch in the phrase (C# D E B).
The phrase "rain pourin' down" is sung to a descending melody, with "down" sung with a descending glissando (D C# B B~A).
The sequential words "safely" and "securely" alliterate and rhyme, and these repeated sounds lend a sense of that steadfastness.
