Best single volume guide to classical music

If you are looking for recommendations for not just pieces, but good recordings of those pieces, I recommend “1,001 Classical Records You Must Hear Before You Die.”  It is organized chronologically by date of composition and covers early, pre-renaissance to 21st century music.  I like the examples chosen for each era and the specific recordings are also quite good.  The balance of selections-between large scale, chamber, solo, choral and vocal works is reasonable.

I haven’t actually read this type of book in decades, so any recommendation I might make will be outdated and perhaps unavailable.  Martin Bookspan had a book that I used in the seventies, and I saw a copy in a used bookstore a bit back.  You might try a college bookstore and see what they have in the music appreciation section 

I would start with something simple, then go for ’best’.

https://www.google.com/search?q=guide+to+classical+music&rlz=1C1JSBI_enUS1081US1081&oq=guide+to+clas&gs_lcrp=EgZjaHJvbWUqBwgAEAAYgAQyBwgAEAAYgAQyBggBEEUYOTIHCAIQABiABDIHCAMQABiABDIHCAQQABiABDIGCAUQRRg8MgYIBhBFGDwyBggHEEUYPKgCALACAA&sourceid=chrome&ie=UTF-8