Charles Rosen has his fans... and, well-- I'm not one of them.
But hey, if you're enjoying the read, you could well be in better company than me.:crazy:
On the matter of a "period-specific" book on Romanticism in music, I'd advocate Vindications- Essays on Romantic Music by Deryck Cooke. Because it consists of essays, the topics contained are limited- but very worthwhile nonetheless, such as- a Wagner essay [Cooke is probably the foremost English-language Wagner commentator of all-time], an expedition-leader's guide through the morass of alternate versions that make up the Anton Bruckner symphonic canon, a thoroughgoing analysis of Beethoven's Late String Quartets, and (for those of us who feel a little unsettled by non-tonal music) a great statement-summary essay titled "Reactionary.":clap: