Wal-Mart the Musical opened here Friday , with a cast of two dozen New York actors , hired to play blue-smocked employees , singing and dancing their way through the giant retailer 's shareholder meeting with numbers like '' Walk Across the Aisle '' -LRB- about buying fashion -RRB- and '' The Day That I Met Sam '' -LRB- about Wal-Mart 's founder , Sam Walton -RRB- .