I wore off my first copy of Piece of Mind in cassette. Then bought it on CD, which I still have. I now buy CDs for longevity, they go straight to MP3, but the CDs are kept safe.When I was younger I played Led Zep IV so much I broke the cassette. It just fell apart one day. Seems barmy that all those tapes can fit on a tiny memory card or my phone, I still can't bare to chuck them though.
