The theme for this drama program, the longest running weekly prime-time drama currently airing on US television has always been a variation of Jean-Joseph Mouret's "Rondeau" from Sinfonie de Fanfares. The title of this program was shortened in 2009 when Gillian Anderson briefly became host, though for its first 21 years, Alistair Cooke was the host. Identify this long running program which, when it featured the British serial Upstairs, Downstairs, became the first PBS program to win the Emmy for Outstanding Drama, doing so in 1974, 75, and 77 (give any of the titles it has been known by .. we really only need the one word in common with all of its iterations' titles).
Masterpiece (Theater or Classic, or Mystery, or Contemporary)