I can start off.
Just to be very clear, the broadcasters pay a tariff to copyright owners for the right to broadcast music. Currently they also pay a tariff for making the temporary technical reproductions that are merely incidental to that broadcasting process.
Bill C-32 removes the requirement for broadcasters to pay the tariff for these reproductions, while retaining the requirement to pay for the right to broadcast itself.
Twenty years ago, with the technology at that time, these payments didn't exist. Radio stations would play music directly from CDs with no reproductions, but technology has changed, and radio stations now broadcast via computers in a process that requires digital copies of songs to be made. Under current law, broadcasters are required to pay for these incidental copies. Removing this payment requirement will promote the adoption of new technologies in broadcasting and make the rules governing broadcasting technologically neutral.
Radio stations and record labels determine their business arrangements with broadcasters in the delivery of song tracks to radio stations for broadcasting. Copyright law, as marketplace framework law, is supposed to allow for and promote these kinds of market solutions. As technology evolves, the removal of the ephemeral recording exception makes this treatment of broadcasters technologically neutral.