If the recording giants can restrict the use of MP3 players, then they will realize they can slow or stop the growth of MP3 and its impact on their business.
(the recording giants; can restrict; the use of MP3 players) (they; stop; the growth of MP3 and its impact on their business)
the recording giants they
can restrict stop
the use of MP3 players
the growth of MP3 and its impact on their business