There is no specific patron saint of drummers. However, there are several patrons of musicians: Benedict Biscop Blaise Cecilia David the King Dunstan of Canterbury Genesius of Rome Gregory the Great Notkar Balbulus Paul the Apostle
There are no patrons of hearing but there are patrons against deafness:Cadoc of LlancarvanDrogoFrancis de SalesMeriadocOuen
Yes, Saint George is a patron saint of Moscow.
The patrons of mathematicians are Saint Barbara and Saint Hubert of Liege.
Patrons of altar serversJohn BerchmansTarsicius
There are patrons of families:Francis of AssisiJosephMaximillian Kolbe
Saint Columba, one of the patrons of Ireland, is the patron of Derry.
The patrons of the Netherlands are:Bavo of GhentPlechelmWillibrord of Echternac
Not "of Denmark". There is a saint called Anne, but she's not particularily Danish.
There is no patron saint of entertainment. However, there are patrons of actors, actresses and musicians.
Consulate-General of Denmark in Saint Petersburg was created in 1906.
No. No patrons are assigned to any mythical creature.