Being a Generation Xer, two of my favorite sad songs are Eric Carmen’s “All By Myself” and The Motels “Only the Lonely”. Of course loved Carmen “stealing” the melody from Rachmaninoff and he wrote a Rachmaninoff like instrumental middle section in the long version of the song.
Manilow basically did the same thing on "Could This Be the Magic?" which he lifted from Chopin.
The Rachmaninoff 2nd piano concerto spawned three songs: Full Moon & Empty Arms, I Think of you, and Eric Carmen’s plagiarized All By Myself. Quite a melodic piece.