Short answers, pulled from the story.
Warner Bros. Pictures, Inc. was founded on the 4th of April 1923 by Harry, Albert, Sam, and Jack Warner. The four brothers from Canada transformed their small film distribution business into a major studio in the United States.
Warner Bros. released The Jazz Singer on the 1st of November 1927 as the first feature-length motion picture with synchronized dialogue. This film starred Al Jolson and rendered the silent film era obsolete overnight.
Warner Bros. merged with Seven Arts Productions on the 1st of July 1967 to form Warner Bros.-Seven Arts. This corporate structure change was driven by the need to expand into television production and compete with other media conglomerates.
Warner Bros. Records was established in 1958 to support the studio's film soundtracks and was spun off from the parent company in 2004. The label became an independent entity known as Warner Music Group after the divestiture.
AT&T acquired Time Warner on the 15th of June 2018 and renamed the company WarnerMedia. This acquisition was part of a larger trend of media consolidation to compete with streaming services like Netflix and Amazon Prime Video.