wall of sound
Noun
Meaning
A popular music production technique, developed in the 1960s, in which a number of musicians perform the same instruments or parts in unison and the resulting sound is re-recorded in an echo chamber.
A densely layered sound, often a piece of music.
Source: en.wiktionary.orgExamples
I started writing instrumentals but Roma pointed out they were very visual, so she started writing lyrics .. and Nicky had this idea of creating a wall of sound and started multi-tracking my voice.
Phil Spector 's Wall of Sound recording technique was, it has been claimed, heavily influenced by Wagner.
Because of this, Alembic would play an integral role in the research, development, and production of the Wall of Sound.