To put it mildly, Derek, VERY CONCISE. And if you recall, I was SA~CD.net's 'bad boy' always injecting popular music and jazz into an equation purposely re~directed by moderator Zeus towards what HE liked........Classical.
And since, like Surround Music, Classical music remains a VERY niche market [8~10% of the population], unless you're a musicologist or classical musician,
a lot of the classical repertoire can be monotonous and tedious and even numbing. But then again, there's a lot of popular music which can have the same adverse effect.
To educate a newbie, like GOS as to what he should dip his toes into would be a very difficult proposition but a GREAT start would be to literally gobble up those discrete classical QUAD SACDs which Dutton Epoch has released in the past few years. Most of them are of a more accessible nature, melodious and beautifully recorded and I would also suggest almost anything by musical impressionists Debussy and Ravel and even Fauré and Schumann for a beginner potpourri of magnificent compositions and Stravinsky for the more musically adventuresome and of course your beloved Mahler for his incomparable symphonies and all those TACET Beethoven MOVING SURROUND SACDs for 4 corner immersion. And lest we forgot those fabulous Brits: Ralph Vaughan Williams and Edward Elgar.
Unfortunately and I've already chimed in on THIS topic: Most Classical SACDs and even DVD~A discs are content with offering ambience in the rears which do turn almost ALL QQer's OFF. After all, why did I invest in an elaborate surround system to hear an echo of the fronts in the rears, and with ATMOS, overhead and that same criticism spills over into poorly remixed popular fare.
For that my friends is why I personally am a HUGE advocate of Blu Ray and UHD 4K movies where your system will almost NEVER disappoint you in the IMMERSION department...unless you're into sappy love stories or those oldie but goody B&W movies from a bygone era.
As for Steve Reich's COME OUT ~ BAD HAGGIS, Derek!