Do you like music? Do you like to play music? Do you drum or sing? Musicians' Guild is for you If any of these apply. None? Apply to here anyway by telling your hero 'Join "Musicians' Guild"'. Don't cancel your current quest (unless you're on a quest to join another guild which then stop said quest and send as soon as you start a new quest) beforehand. It won't work if you do.
Musicians' Guild is composed of primarily of, well, musicians. Minstrels and rockers alike celebrate the haven from scrutiny about their addiction.