I've followed Robin Frederick on Taxi for a while. IMHO her insights into what executives and, ultimately, audiences want are gold if a market is what you are looking for.

What I'm not so sure about is a methodical approach to creation eg http://mysongcoach.com/write-a-song-in-ten-steps/ Creativity and critique are very different beasts. Sure you can start with a song title as an idea but I'm sure most people will find themselves in a wilderness of their own making in a very short period of time. Once you've navigated your way out with a song then maybe you can polish it using the excellent advice she has to offer.

Maybe I'm being too hard. Her songwriting tips might be good for those new to the game.