How about some of those really cheesy recordings William Shatner made in the 70s?
I saw video clips of some of those once on some TV show and laughed until I had tears running down my face.
"Aint no sunshine when she's gone....
I know-I know-I know-I know I know-I know-I know-I know I know-I know-I know-I know..."
That stuff is priceless and needs to be retained in a time capsule.
Or used for interrogation.
"Tell us what we want to know, or the demons shall come howling for your soul!"
*Press play, watch subject melt.*