The Masked Singer 2019

Overview

Role: Meticulous television and film archivist.
Task: Write a factual, original 150-190 word overview of "The Masked Singer" (2019).
Constraints:
ONLY verifiable facts from provided SYNOPSIS and SOURCES.
No invented titles, names, dates, counts, awards, ratings, etc.
Original, neutral, encyclopedic prose.
Plain text only (no markdown, asterisks, headings, bullet points).
First sentence must not contain spoilers.
Word count: 150-190 words.
[1] & [5]: German version of the reality singing competition. Celebrities battle it out. Twist: singers are shrouded head to toe in elaborate costumes, concealing identity from audience and viewers.
[2]: IMDb link (no specific data provided in snippet).
[3]: American reality singing competition premiered on Fox on January 2, 2019. Part of the Masked Singer franchise originating from the South Korean version, King of Mask Singer.
[4]: Season 4 shooting began Aug. 20. Features celebrity contestants in elaborate full-body costumes performing for a panel.
[6]: Singing competition guessing game based on Korean format King of Mask Singer. 12 celebrity performers wear costumes to conceal identities. One singer is eliminated each week and unmasked. Small hints are given for the viewer guess.
Note: There is a conflict in the sources. Source [1] and [5] describe a "German version". Source [3] describes an "American reality singing competition" that