I am reading Dr. B.-G. Cohrs's note [C] on the (fascinating) history of the Symphonisches Präludium, now commonly attributed to Anton Bruckner. I was a little mystified by the following remark:
The form is quite unique — all three themes are merely lyrical [...]
Is this standard terminology in music analysis? What other types of themes are there? Why is it unusual to use only entirely lyrical themes?
I am looking for sources that discuss such matters. Do standard textbooks (or other scholarly sources) on large form in classical music address these distinctions? Are there any other places where I could find a more detailed taxonomy of themes in classical music?
[C] Benjamin-Gunnar Cohrs, Symphonisches Präludium — composed by Anton Bruckner? Available online through the Bruckner Society of America.