Short answers, pulled from the story.
Mercury Records was founded in Chicago in 1945 by Irving Green, Berle Adams, Ray Greenberg, and Arthur Talmadge. The label began operations shortly after its founding to compete with established giants like RCA Victor and Decca Records.
The first documented use of overdubbing on magnetic tape occurred in 1947 when Jack Rael persuaded Mercury Records to let Patti Page record a song that had been planned for Vic Damone. This technique allowed Page to record both voices herself, setting a precedent for future music production.
Mercury Records initiated the Living Presence series in 1951 under the direction of recording engineer C. Robert (Bob) Fine and recording director David Hall. The series used a single microphone to record symphony orchestras to create a sense of being in the room with the orchestra.
Mercury Records released hits by musicians such as Paper Lace, Rod Stewart, Bachman-Turner Overdrive, Thin Lizzy, 10cc, Rush, Jerry Butler, and Melba Moore during the 1970s. The label later absorbed artists from Casablanca Records including Kiss, Donna Summer, and the Village People under PolyGram Records, Inc. in 1981.
Mercury Records was closed and folded into the newly formed The Island Def Jam Music Group in 1998 after PolyGram was bought by Seagram. Mercury's pop roster was taken over by Island Records, its hip-hop acts found a new home at Def Jam Recordings, and its country unit became Mercury Nashville Records.
Republic Records announced in 2022 that they had acquired Mercury Records, and it continues as their imprint. The Mercury name survives on the Mercury Records division of UMG France, the Mercury Studios film division, and catalogue reissues in the United States, United Kingdom, France, Japan, and Brazil.