Andrei MihaiOrganizers of one of Britain’s best-known music festivals on Tuesday have backed up their decision to keep Jay-Z as the headline, despite the complaints received from several rock stars, “headlined” by Noel Gallagher. The outdoor Glastonbury festival is really important for brits, and well… most just don’t think it’s right to have a rap artist as a headliner. This of course caused the disappointing ticket sales, as it hasn’t sold out yet, contrary to previous…