Are you interested in performing arts? If you are, you might find Tdf.org an interesting site to check out. This is the official site of a non profit organization known as Theatre Development Fund. This organization provides support to theatrical works and performing art centers.
This website can provide you data about current plays like Mamma Mia or The Lion King, along with the Jersey Boyz and many others. With Tdf.org you can buy show tickets, just by browsing through the NYC tickets section. You can search for Mamma Mia and The Lion King show tickets, in addition to the Jersey Boyz and other plays produced by different performing art centers.
Take a look at Tdf.org if you wan to buy NYC tickets. On this site you can get information about the Jersey Boyz, Mamma Mia, and The Lion King plays, along with other plays of different performing art centers.