Other information for the Music Hall of Homestead, in Munhall PA-- They appear to handle their own ticket sales and you MUST create a Carnegie music hall account to proceed with the ticket purchase process. So you should create that account in advance so you are all set for when the tickets to Justin's Aug. 2 gig go on sale on 3/30/13. Link below takes you to screen to follow through on creating an account with this venue:

https://www.carnegieconcerts.com/login.asp?gifrompage=2&gitopage=2