I ditched Spotify and set up my own music stack

Because CD has not been superseded by any other physical media? Nobody sells music on an USB stick or on a microSD card. If I go to buy music, it will be always CD.

> CD has not been superseded by any other physical media

What's a Blu-ray DVD disk then?

If there still was a mass market for music on physical media, CDs would have been superseded, either by an optical disk or some kind of SD card.

But there isn't. so it hasn't.

Where can I buy music on a Blu-ray DVD? They are simply more expensive, while nobody needs the extra space for music data. At least where I live music is only sold on CD. There are new vinyl disks being produced for a retro market, but a player for these needs significantly more space then a Compact Disc. In addition to buying a new player I would also be bound to only play music at home. Every car has a CD tray, my laptop has one, I have several players at home.

> Where can I buy music on a Blu-ray DVD

The format and equipment exists, it's called "blu ray audio"

The fact that it's not in widespread use is my point exactly: the mass market isn't there any more.

> Every car has a CD tray,

I think that will go the way of a headphone jack on a iPhone. Cars have bluetooth.

> my laptop has one,

CD players on laptops literally have gone the way of a headphone jack on a iPhone. They're rare to non-existent on new models.

> I have several players at home.

So do I - they're in a box somewhere.

You're not refuting my point at all - there's not successor to CDs, not because it's a perfect, modern medium for physical music. But just because there is no longer a mass market for music on any physical media.

I recall reading a report somewhere that vinyl sales are higher than CD sales in the US.

I don't know anything about the data. But I literally just purchased a record player that my soon to be 14 year old daughter requested for her birthday. She doesn't have and has never requested a CD player.

Right, and the same argument applies: "But a USB/MicroSD format would carry more bits in a smaller space than CDs, and be less fragile, it's just a more convenient physical format for music!"

But a) there is no mass market for any physical format any more. It's driven by nostalgia. And b) There's more nostalgia for Vinyl than for CDs simply because they were the main medium for much longer. Of course CDs are less fragile and bulky than Vinyl, just like SD cards are less fragile and bulky than CDs, and streaming on existing devices is even more convenient. But that's not the driving factor. It's all fun until someone leaves their Vinyl record collection in a hot car for a few hours.

I think microSD cards are a bit to small to be convenient. They easily get lost or broken. USB has a nice form factor for storing and transport but the UX for the player is worse, as the stick doesn't vanish in the player like a CD or a microSD card. I think the best UX, would be an SD card the size of a bank card, that can be put in a slot, but the marginal difference to a CD is really low.

> The fact that it's not in widespread use is my point exactly: the mass market isn't there any more.

Their might not be a mass market for neither, but these are not available in the same scale at all. You maybe can find blu ray audio somewhere on the internet, but I've never seen them, while the the music store has hundreds of CDs and every street musician and band sells CDs.

I honestly do not know what the selling point of a Blu-ray disk is. The form factor is exactly the same and nobody needs the capacity. The capacity of a DVD is already too large, why should anyone use a Blue-ray disk? Neither want the musicians produce and sell more than some hours of music, nor do consumers need music for days without interruption. There simply is no kind of music which takes more than a few hours.

So the only difference is that the disk is more expensive and the player is likely incompatible, so hardly a benefit.

> So do I - they're in a box somewhere.

I was only talking about players in use.