The numbers above the poem’s words represent a seven-tone tonic scale of your choice, or as suits the mood of the poem:
Ionian: Bright, joyful, most common scale in Western music. White key octave starting with C (i.e. 1=C, 2=D, 3=E, 4=F, etc.).
Dorian: To some ears, tense and dark, to others the mid point between Ionian and Aeolian. White key octave starting with D.
Phrygian: Towards the darker side of moods. White key octave starting with E. (See Gypsy scale below.)
Lydian: Considered the happiest, lightest mode of the traditional Greek modes. White key octave starting with F.
Mixolydian: Considered to be midway (neutral) in mood. White key octave starting with G.
Aeolian: Sad, serious, disquieted. A simple minor scale (notes do not change in descending scale). White key octave starting with A.
Locrian: Very rarely used, does not resolve naturally (to Western ears). White key octave starting with B.
Gypsy scale: Phrygian scale with raised third (octave starting with E: EFG#ABCDE). Irresistible.
Flats (-) and sharps (+) are indicated but optional (use them if they sound good, otherwise use the neutral note).
From bright to dark in mood: Lydian, Ionian, Mixolydian, Dorian, Aeolian, Phrygian, Locrian
Please note there may be errors in the translation of the notes into numbers and there will always be fuzzy areas where words are pronounced differently by different speakers (singers) and even in different contexts.