I am not aware of any conflict between Mudcat and Sing Out! I am proud to be involved with both.
I really don't recall whether Sing Out! has ever mentioned Mudcat, but we do not usually write about e-communities. We write about Folk Music broadly defined, i.e., its performance, history and practice and we review more "Folk" CDs (with very knowledgeable reviewers) than anyone else.
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sj