Phil Spector was an American record producer and songwriter who had a net worth of $50 million at the time of his death.

His net worth could actually be much higher, depending on his current ownership status of what would presumably be one of the most valuable song royalty catalogs in the world. 

Certainly the most valuable ever collected by a producer, as opposed to an artist/songwriter. 

Certainly the most valuable ever collected by a producer, as opposed to an artist/songwriter. Between 1960 and 1965, 24 Spector-produced albums hit the Top 40. Spector produced the songs "Unchained Melody" and "You've Lost That Loving Feeling", for the Righteous Brothers. Both tracks would eventually be among the most valuable songs of all time due to their use in movies and cover versions. 

BMI reported that "You've Lost That Loving Feeling" is the most-played song of the 20th century. 

Those two songs alone have generated more than $100 million in royalties to date for Spector, the songwriters and the artists. 

Phil produced The Beatles album "Let It Be" and John Lennon's most notable solo work including "Imagine" and "Instant Karma".

John Lennon called Spector "the greatest record producer ever." Brian Wilson of the Beach Boys called Spector "the biggest inspiration of my life."