Special ticket for singers and friends: 2 regular tickets for 15$.
Special price for Singers for your family and friends, 2 Regular tickets for $15. Your guests pick up tickets at Will Call; enter their name(s) in Additional Information on the checkout page.
You will only purchase one singer-special, and the will call agent will know to admit two guests (enter 2 names in the comments). Purchase 2 specials, 4 guests. You get it.