This latest bundle is awesome. I am really enjoying the Quad mixes. I love the expansive, wrap-a-round sound, the muted trumpets sounding like they're coming from beyond the studio, the background vocals in their own place, the lead vocals in the front and sometimes moving around the soundstage. Percussion accents are placed high in the mix. The strings swirl both above and below. You don't just hear the bass notes, you feel them. These quad mixes balance the individual voices with the overall sound. I really feel like I am in the presence of the band, eavesdropping on their interactions. These are four lovely albums with great songs, performance and production. One of my favorite tracks is Roberta Flack's No Tears (In the End). Absolute bliss!