Based on the standard tracklist for Led Zeppelin IV (also known as the untitled fourth album), a "Master Series" release would include the following content: Core Album Tracklist
Here's a breakdown:
We were granted a single listening session of a verified "Series X" 24-bit file set. Here is how this exclusive master transforms each track: led zeppelin iv yeraycito master series x exclusive
These unofficial releases sometimes bundle the "Companion Audio" (alternate mixes) found in official Deluxe Editions , such as the Sunset Sound Mix of "Stairway to Heaven". Standard Track Listing Based on the standard tracklist for Led Zeppelin
“I’ve heard the original master, the Classic Records reissue, and the 2014 hi-res. This is different. The veil is gone. It’s like Page just handed you the console.”
— Unnamed rock audiophile, early preview. Beats MoFi One-Step (more dynamic, less eq)
Source Material: Often sourced from "A1/B1" matrix UK pressings, which are considered the definitive analog sound by collectors.