Lyric discussion by FishesWillLaugh 

"your merry, merry month of May" - seems to me to be quite sarcastic, as in if you died in the month of May, it wouldn't be so merry after all. Again, saying that death can come at any time, and in any form.

"Who shall I say is calling?" - I agree with "track", he's questioning who is it that decides, the when and the where.

Fabulous, chilling stuff. Thank you , Leonard.

"who in your merry merry month of may, who by very slow decay,"

I think it means who will die young in their prime (may implies spring time and youth) and who will die old and suffer through aging and gradual decline in health.

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