Just generally on the MAIL ART topic: I fully 100% advocate for the use of philately-related terms among industrial/noise/power electronics tape enthusiasts, as it's of high relevance when discussing pre-internet culture.
Just off the bat there's the *very rare* Comando Bruno Serunkuma "Cuaderno De Campo" cassette that cleverly uses the stamp template for a cassette cover, and back cover of the Comando Bruno & Avant-Dernières Pensées "Muestras Sin Valor" LP (which I very much enjoy although it is seemingly of no value). These examples make me think about the strong correlation that there is (or was) between release artwork and packaging materials. Hence it's an easy transfer from a tape sent in the mail to mail art as a topic. One is obviously therefore a simple extension of the other. I don't know why I picked two Comando Bruno releases: they are good examples but not definitive. This thread is a great opportunity to add to this field of releases.
Perhaps another thread is needed to fully explore the breadth of releases that featured components related to philately/mail art in their design? Or maybe my interest can be accommodated here.
Even today, the mailing of physical product is a stage of its existence. The packing and boxing of work is so integral to the process of churning out releases.
& of course, the "mail collaboration" could be seen as a type of release all it's own.
-FâLX çèrêbRi "Pyogenic Organism" cassette from 1983 being a neat little example that also crosses into early power electronics territory in terms of aesthetic.
-Death Pact Mailmusic (brief label in the 80s for DPI personnel) is another fine example.
-As is this: