1 - If there is anyone that needs to have a definition of "Jewish Music" it would be someone who has a "Jewish Music" radio show.
You are free to disagree with his definition, but to challenge his right to have one seems funny to me.
2 - Did Toker explain why he doesn't consider Hanan Ben Ari "Jewish Music"? I know even less than you do, but I think it is reasonable to assume that he had some reason (unless you know otherwise).
3 - Your point about personal responsibility sets aside the fact that communities/schools/parents have a responsibly to set guidelines for those who are not yet ready to make that determination for themselves.
I don't think it is practical to ask parents to approve each song individually. A definition of "Jewish Music" is a helpful tool in explaining a standard without having to do so.
4 - There will always be debate about what fits under the label of "Jewish Music" and what doesn't. This type of debate takes place within every genre of music. I am not sure why you seem to be opposed to such debate when in comes to "Jewish Music"
1) agreed. He has every right to draw lines, as I wrote about schools, sects, etc. His radio channel would be included. I'm just pointing out how weird it is that this is considered part of Jewish music and "a new low", but Ben Ari is not even considered Jewish.
2) Not to my recollection. I'm sure there is a reason why Ribo yes and Ben Ari no, (picking these names because they were the ones mentioned) and likely it's obvious to Israelis who know the people and scene, I just don't know why.
3) Who is in charge of this collective? I know of one mashpiah in CH who called 8th Day "chazer treif". Is he in charge? Or is it the one who thinks groups like 8th Day are vital in keeping kids intrested in Yiddishkeit?
4) That debate has raged in this very thread many times, and I've been part of it. My point is, again, there is no deah zogger who decides. It's a personal decision, either by the individual or institution. If you don't think it's Jewish, it's not for you. There is no collective voice to make the judgements for you.
I feel like Israeli music especially has so many blurred lines. An entirely secular non religious artist can write a beautiful, deeply spiritual song, and vice versa, unfortunately. Being upset that the latter is somehow part of Jewish music seems weird to me. Just say it's not Jewish and be done with it.