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This list is full of redlink names (those with no article) which also have no reference to demonstrate that they might satisfy notability. There might be several groups which have used the name. Some might be vanity entries or random additions. This is contrary to WP:LISTCOMPANY which says
"A company or organization may be included in a list of companies or organizations whether or not it meets the Wikipedia notability requirement, unless a given list specifically requires this. If the company or organization does not have an existing article in Wikipedia, a citation to an independent, reliable source should be provided to establish its membership in the list's group." (bold added). I am removing the redlink entries which do not have such a source. Edison (talk) 18:57, 15 September 2015 (UTC)[reply]
I have removed the unsourced redlink entries, one unsourced entry which was not even a redlink, and several which appeared to direct to Wikipedia articles, but which actually directed to a Wikipedia article which was not about a Polish jazz group. I added a reference section where the sources will display when any groups are added with reliable and independent sources which demonstrate their notability, thereby disambiguating and providing the basis for an article. Edison (talk) 19:41, 15 September 2015 (UTC)[reply]