OKLAHOMA CITY - Microsoft is celebrating the opening of its new store at Penn Square Mall with a concert from country music star Tim McGraw.

McGraw will perform Sunday, but fans who want a chance at attending the concert must start lining up Friday at 10 p.m. at the mall. The line will form outdoors near the entrance between Cantina Laredo and Jos A. Bank.

On Saturday, the Microsoft retail store officially opens, and tickets will be handed out for McGraw's free performance. The concert is scheduled to begin at 4 p.m. Sunday.

Tickets to the concert are limited, and will only be distributed during Saturday's grand opening ceremonies.