Tom Dunne's Music & Me: My CDs - should they stay or should they go?

Your CD collection, that array of disks you collected that have soundtracked growing up, your love life, going out and now staying in. Should you just bin them? I ask this as someone with skin in the game. I own about 7000, 6000 of which are not neatly boxed in the attic, the entire attic. In ways they are my life, but in this streaming age, are they just landfill?
I say ‘landfill’ because recently a neighbour was getting work done, and asked had I anything he might use to fill in the spaces between the bricks. ‘Old stones, broken paving, anything with mass,’ he asked. ‘Something that weighs a ton and is worthless,’ I was trying to imagine what might fit this bill when suddenly and without warning, my neatly boxed CD collection flashed before my eyes.