I Don't Want to Set the World On Fire

How do you preserve a precious e-mail? What happened to all the priceless chat from pre-internet days on bulletin boards? When all of us who remember an old, old song have died, will that song be around, and if not, will anybody care? Do you know what tunes went through your grandmother's head? Did your great-grandmother go to the cinema and if so, what did she see? what did she like?
While a lot of bloggers have the latest hits running through their heads ("earworms", love that neologism) I occasionally find myself in thrall to "Mairzy Dotes and Dozy Dotes" or "I Don't Want To Set the World on Fire", which is (hard to believe) not in the Rudy Vallee official hits CD. I think, and I should check on this while there is still time, that this was my father's all time favourite song. My mother used to sing Mairzy Dotes to me when I was a toddler, along with late-40s and early-50s country songs or hit songs. Mom was not a big Elvis fan. She was more Bill Anderson, the "whispering cowboy".
So, what runs through your head?