Lost is an American serial rama television series that follows the lives of plane crash survivors on a mysterious tropical island, after a commercial passenger jet flying between Sydney, Australia and Los Angeles, United States crashes somewhere in the South Pacific. Each episode typically features a primary storyline on the island as well as a secondary storyline from another point in a character's life. The show was created by Damon Lindelof, J. J. Abrams and Jeffrey Lieber, and is filmed primarily on location in Oahu, Hawaii.The pilot episode was first broadcast on September 22, 2004. Since then, four seasons have been aired. The show is produced by ABC Studios, Bad Robot Productions and Grass Skirt Productions and airs on the ABC Network in the United States. Its soundtrack is composed by Michael Giacchino. The current executive producers are Abrams, Lindelof, Bryan Burk, Jack Bender and Carlton Cuse. Because of its large ensemble cast and the cost of filming in Hawaii, the series is one of the most expensive on television.