Dunno how current this project is, but the person behind the Optigan site contrived this notion of creating fake homebrew music tapes and planting them in thrift stores. Sounds like a fun idea, if tough to execute.
Kinda reminiscent of Yoko Ono's conceptual pieces. Or my stray notion of Bossy Painting (kind of like commissioning art with ideas, but [ahem] no money).
I modestly propose these titles:
"Xmas at the Ambersons 1973"
"the twins Jake & Janey on their new violins"
"garage door diagnostic pt 2"
"Uncle Paul & Aunt Letitia's hollow pine"
"462 people say hello to Sid, 3 say goodbye"
I'm sure you have your own.