This poem has been set to several tunes by:
(1) Joh Rutter (on these CDs)
(2) German tune (in The [original] Oxford Book of Carols, no. 122; titled "Herrick's Carol")
(3) Richard Rodney Bennett (in Carols for Choirs 3, Oxford, no. 49)
(4) M. Henry Laws (score not seen)
Robert Herrick's Christmas poems site is HERE.
~Masato