In 1969, Hill recruited an additional 44 singers to perform Beethoven's Fidelio with the National Symphony Orchestra (NSO).
For nearly three decades, under the leadership of its founder and music director Paul Hill, the chorale performed a series of concerts at the Kennedy Center as well as appearing as guest chorus for the NSO under the batons of Howard Mitchell, Antal Dorati, Dmitri Kabalevsky, Julius Rudel, Erich Kunzel, Neville Marriner, Mstislav Rostropovich and Leonard Slatkin.
Sondra Goldsmith Proctor and J. Thomas Mitts, respectively, served as rehearsal accompanists and assistant directors in addition to performing on keyboard with the chorale in numerous concerts.
The chorale accompanied by orchestra performed Randall Thompson's Frostiana and, joined by soloists and children's chorus, Carl Orff's Carmina Burana.
New York Times, Obituary for Paul Hill, 29 September 1999: Spectrum Magazine, "Adventists in the News: Paul Hill" John F. Kennedy Center, Artistic Constituents Good Shepherd Online, "Sondra Proctor" Master Chorale of Washington, History Donald McCullough website Washington Post Article, "Master Chorale to Shut Down" Washington Post Review of 6/17/09 concert, "Master Chorale Exits the Scene On a Graceful -- And Wistful -- Note"