The genre started in the early 2000s, with the creation of Harry and the Potters. More bands soon followed -- The Whomping Willows, The Parselmouths, Ministry of Magic, and a parody band known as Draco and the Malfoys being just a few.
The Wrock genre is defined by lyrics that focus solely on the Harry Potter franchise. The bands first started to play at conventions and small fan concerts, but many have found widespread success with the support of the fandom. Harry and the Potters, for example, have released three full-length studio albums and have starred in several documentaries.
(For those of you who don't know, a fandom is a subculture made up of fans who share a common interest, like Harry Potter. In essence, fandom = a community of people who love something).
And now, for your listening pleasure:
-Harry and the Potters - "Save Ginny Weasley From Dean Thomas"
-Draco and the Malfoys - "My Dad is Rich"
-Ministry of Magic - "The Bravest Man I Ever Knew"
-Ministry of Magic - "The House Song"
-Riddle TM - "For Jo"
-Oliver Boyd and the Remembralls - "Flight of the Prince"
-The Parselmouths - "My Obsession"