I put Bob in contact with Mark Moss, editor of Sing Out!. Mark said there are major changes to the magazine that will be announced soon. Right now, the magazine's Facebook page is very active, and there's a podcast that seems to be coming out regularly - maybe even weekly.
-Joe-

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I found an interesting article from Pennsylvania Center for the Book:

https://pabook.libraries.psu.edu/literary-cultural-heritage-map-pa/feature-articles/who-are-these-folks-and-their-music-history-sing

From the text of the article, I gather it was written about 2011 (Pete Seeger was 91 years old)