On the "unsung" side of the spectrum, I've recently listened to Gaziza Zhubanova's Symphony no. 1 Energy and EH Meyer's Viola Concerto. Neither made a very big impression on me, but the Zhubanova has a striking organ solo about 3/4 of the way through.
Listened earlier today to Brahms' PC 2 with Gilels/Jochum. I'd forgotten how much I loved this work. I actually prefer the second PC by some distance to the first PC, with the exception of the menacing opening of the latter. PC 1 seems to have too much note-spinning.
Ha!! Excellent taste :) No one does the Brahms better than the Gilels/Jochum combination imo. The opening of the First is indeed absolutely marvellous: savage, biting, snarling, rasping music ;D ;D