One of the mysteries of the English language finally explained.
Definition of opry in US English:
opry
(also opery, op'ry)
noun
US1Informal= "opera". Frequently attributive, especially in "opry-house".
2In full "Grand Ole Opry". A regular concert of country music broadcast from 1940 as a radio (and subsequently as a television) programme, from Nashville, Tennessee; the venue where this concert is held; the type of music characteristic of this programme. [Grand Ole Opry is a trademark.]
Origin
Mid 19th century. Variant of opera.