The Wall of Sound is a music production technique for pop and rock music recordings developed by record producer Phil Spector at Gold Star Studios in Los Angeles, California, during the early 1960s.

Working with such audio engineers as Larry Levine and the session musicians who became known as The Wrecking Crew, Spector created a dense, layered, reverberant sound that came across well on AM radio and jukeboxes popular in the era. He created this sound by having a number of electric and acoustic guitarists perform the same parts in unison, adding musical arrangements for large groups of musicians up to the size of orchestras, then recording the sound using an echo chamber.