I'm not offended about the non-native comment - I presume you are trying to say that some of the copy sounds like it's been written by someone who speaks english as a second language? This is interesting because it has been worked on by 3 native english speakers (one of them is also an english lit. graduate!). Maybe the problem is actually the fact that three people are working on this copy and another problem being that we are all very close to the product.
We would like to say more about the type of content - it's not music, so the fact that you think it is, is not good. It's all spoken word programmes (audio documentaries, interviews, discussions, stories etc.). Does 'spoken word programmes' sound like a good way to explain this type of content?
I also agree about the periodical comment. The fact that we will be pushing you content on a periodical basis is more of a detail for later explanation. Maybe the word 'regular' sounds better than 'periodical'.