Surprisingly hard to get hold of are two piano concertos by Felix Mendelssohn. I've listened to both of them within the last few days and think they are both wonderful. What a great musical craftsman Mendelssohn was. I know his music is not specially popular today (other than a few works such as the late Violin Concerto) but, honestly, those two piano concertos have so many beauties it's sad that they are not hugely well known.
Mendelssohn's use of the orchestra is also very economical and pure. Every phrase is as delicate as porcelain. I really rate this composer and already love so much of his music. Highly recommended to those who perhaps have not heard much of him.