"We've recorded over our voices once and double the harmonies, make them thick. The Four Freshmen do that"

In this quote, Bruce Johnston is going over the recording process for music. He points out that they have recorded over their voices as soon as, which means they have actually already laid down the primary vocal track. Then, they have actually doubled the harmonies, which indicates they have actually added a second layer of vocals to produce a fuller sound. Johnston explains that this technique is utilized to make the harmonies sound "thick," or more robust and prominent in the total mix. He then references The Four Freshmen, a vocal group known for their detailed harmonies, as an example of artists who also use this method. In general, Johnston is highlighting the significance of layering vocals to develop a rich and vibrant noise in music production.