Final answer:
Phil Spector is the producer known for using the Wrecking Crew to create the 'Wall of Sound' and produced bands labeled as 'Blue Eyed Soul,' such as The Righteous Brothers.
Step-by-step explanation:
The producer who used the Wrecking Crew as session musicians to create the "Wall of Sound" and worked with groups that were labeled as "Blue Eyed Soul" was Phil Spector. This innovative recording technique involved dense, layered, and reverberant sounds that created a full and rich musical soundscape. Spector was known for his work with various bands during the 1960s, including The Righteous Brothers, who were often associated with the term "Blue Eyed Soul" due to their soulful singing style contrasted with their Caucasian ethnicity.