I’ve stumbled on Eugen D’Albert maybe fifteen years ago or so.  I was shocked how good his music was and unknown he was. He is a Scottish-born German composer who was also a pianist (you can still find recording of him playing works of other composers).  Similar to Moszkowits he lived in the Rachmaninoff’s era and his music as you’ll hopefully see is Rachmaninoff’s caliber.  Here is his Piano concertos Number 1 and Number 2 (part 1 and part 2).  D’Albert loved the institution of marriage, he frequented it quite often  – he was married six times.  While I was looking for links of his piano concertos I stumbled on his cello concerto that I was not aware of (here is part 1, part 2 and part 3).