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This RS question is whether Stephen Hill, the cofounder of a notable niche music genre, ""spacemusic"", can be disqualified as a secondary source expert, and have his radio production company's website (= expert's book) reclassified with primary source usage restrictions (results in removal). 

The radio production company is Hearts of Space established 25 years ago (35 including the original Music From the Hearts of Space show on KPFA). HoS was historically played on more than 250 USA public radio stations on a scale of 500. This 2004-01-11 San Francisco Chronicle description of Stephen Hill's expertise reads: 
""Hill, who coined the term ""spacemusic"" more than 20 years ago, hosts the ""Music From the Hearts of Space"" music program, syndicated on 250 National Public Radio stations, including San Francisco's KALW 91.7 FM, which airs two hours of the program at 10 p.m. Sundays. In addition, Hill's Hearts of Space Web site (www.hos.com) provides streaming access to an archive of hundreds of hours of spacemusic artfully blended into one-hour programs combining ambient, electronic, world, New Age and classical music.""

The claim as I understand it (maybe I don't), is that a justified primary source reclassification, along with other sources properly reclassified as primary, would cause a synthesis/OR violation in the article titled Space music. The further result would be that the cofounder's detailed analysis, opinions, and other website information would be mostly removed from the article about the genre he cofounded. 

The campaigning editor says his most contentious objection is that the name of the genre is a ""commercial entity's branding drive"". Presumably, he objects strongly to a previously unnoticed form of commercial spam in the Wikipedia article, and a great wrong should be righted by minimizing it. If I correctly understand it, I can only describe this position as extremist. 

Spacemusic genre is a case of limited circle fame. Its current USA public radio fans are thinly scattered, but dedicated to its support through public radio fund drives. Its niche music sales amount to less than 1% of the commercial market, so very little is written about spacemusic in major USA music publications dependent on commercial advertising. 

(The rest of the 102 Space music sources to be considered for reclassification as primary, and then removed for synthesis/OR, should be handled separately to avoid noticeboard overload.) 
 

 I suppose all this would give some reason for caution in using these sources, and particularly a reason to be careful to try to double-source things and to give all sides where sources disagree, but it sounds to me like Hill would be a perfectly reasonable source. Where he is writing about his own work in fostering the genre, or about his own show, he's primary. Where he's writing about the musicians in the genre, it would seem to me that he is secondary, just like any music critic. -  | Talk 

I agree with  on all three points - multiple sources are always recommended when there are differing published views on a topic.  On the primary/secondary question - Hill would be a primary source when writing about himself and his own radio show. On third-party topics such as music styles, record albums, musicians, the radio and music business, etc, he'd be a secondary source.   I'd say that within his area of expertise, there's no reason not to use his work as a reliable source.   

Just to be clear about the encyclopedia-margins deletionist effect of what you are both saying: 

Stephen Hill and his Hearts of Space website were previously treated as expert-based secondary sources via WP:V(WP:SPS). The Wikipedia art/music reasoning has previously been that the founder of an art/music genre knows subjectively more about what he/she created than anyone else as a matter of expert opinion. You are changing that.

What a secondary source says can be combined in a point-by-point source-provable editorial analysis. In this case, since there are so few other mainstream sources, many or most of them are presently combined with Hill's previous secondary source expertise to write the article.

But a primary source has fewer rights in an article than a secondary source. What a primary source says cannot be combined with other sources for a standard article editorial analysis, even if every point made by article editors can be proved through analysis of t