Bloom, who has also worked on shows such as CSI Miami, says a fall in sync fees is inevitable, as film and TV companies aim to cut costs, while bands increasingly look to syncs as a way of gaining exposure.

"I pay five-digit sums for songs that end up in Glee, then for some songs in movies I pay hundreds of dollars," he said. "These are business affairs people counting the beans. They don't put a value on your music. ...