The market is huge though. Whoever steps up and attacks this with VC will do quite nicely.
I wouldn't be surprised to see a startup launched from this article in the next YC round.
And that's besides the legal/licensing horrors.
That being said, I think there might be some promise in an add-on for spotify (web-api / browser extension) or iTunes. Just extend the interface with some more metadata. Surely there are some good databases that can be relied on.
Go to any classical music concert and you will see that under 30s are in the vast minority. Look at how many venues open each year playing modern popular music (ie pop, house, indie, etc) and how many open playing classical music. I'm an active classical music fan in London - one of the classical music capitals of the world - and I cannot name a single classical music venue that has opened within the past 3 years.
Your market is, quite literally, dying.
It's sad. It's a huge loss for us as young people. But the only way a classical music streaming service can survive is through association with one of the big (probably existing) platforms.
The Proms aren't going to go away, nor are concert series in most of the UK's bigger cities. Nor is Classic FM, which is pretty much just Spotify with DJ chat and someone else's playlist, and is a good gateway pusher to classical recordings.
And middle class families will keep giving their kids piano and cello lessons, because that's what they do.
What's happened more - according to people I know - is that the intake at the Royal College and the Royal Academy is almost exclusively posh kids now, because rich parents are the only ones who can afford to hothouse and support their darlings through the exams. It was much more diverse a couple of decades ago, because music education - all education, in fact - was much more freely available.
That will do more to kill classical music than Spotify's metadata will, because it will become something that isn't made available to most of the population.
but I haven't looked at Musicbrainz for many years to see how the rules and tools have changed.
However - no-one else since has even tried to tackle this problem.
Just a couple?
Apparently you should not mess with music. http://www.ycombinator.com/atyc/#n4 "a rogue state with nuclear weapons"
Well there's your problem right there.