Read this: AC/DC: 10 great Malcolm Young moments
Though he doesn't state if any of this music has a future beyond sitting on these cassettes and CDs, Angus praises his late brother Malcolm for being one of the best in the band at keeping track of potential AC/DC material.
"Malcolm was pretty organised with a lot of stuff," he says. "He was more organised than me. When we worked together, the two of us, he'd pick up a guitar, but Mal would take notes and put dates and when it was done. So he was always a little bit more together. But I'd keep notebooks; I've always kept notebooks of song ideas and song lyrics. I've always kept that part together. A lot of songs, I've got 'em all marked up. I know where to look for when I'm going through [stuff]; I've got everything marked up and boxed up."
C'mon, guys, you know you want to release this stuff…
Watch the full video interview with Angus and frontman Brian Johnson below: