Final answer:
The singer known for the soft rock gems 'Song Sung Blue' and 'Heartlight' is Neil Diamond. These songs highlight his ability to combine melodic soft rock with deep, emotive lyrics.
Step-by-step explanation:
The soft rock gems 'Song Sung Blue' and 'Heartlight' are by the singer Neil Diamond. Neil Diamond is renowned for his significant contribution to the music industry with an array of hits that span decades. Not only do 'Song Sung Blue' and 'Heartlight' showcase his melodic prowess, they also exemplify the artist's ability to embed a poetic and emotional depth into his music, thus resonating with a wide audience. While other artists like Elton John, Billy Joel, and Paul McCartney have also created impactful music, it is Neil Diamond who is associated with these particular soft rock classics.