Question: In what year was the band that John Drinkwater was musical director for established?

Context paragraphs:
Ursula Howells: Howells was born in London, the daughter of composer Herbert Howells, and was educated at St Paul's Girls' School, where her father worked as Director of Music.  She made her first stage appearance at Dundee in 1939, in John Drinkwater's "Bird in Hand", then moved to Oxford in 1942 and three years later made her London debut at the Embassy Theatre, Swiss Cottage.  After several years in the West End, and a brief stint on Broadway where she appeared in "Springtime for Henry" in 1951, she began to appear in films.

John Drinkwater (playwright): John Drinkwater (1 June 1882 – 25 March 1937) was an English poet and dramatist.

Abraham Lincoln (play): Abraham Lincoln is a somewhat fictionalized play by John Drinkwater about the 16th President of the United States.  Drinkwater's first great success, it opened in England in 1918 and on Broadway in 1919.  In the New York production, the title role was played by Frank McGlynn.

The Bootleg Beatles: The Bootleg Beatles are a Beatles tribute band.  They have performed over 4,000 times since their establishment in March 1980.

John Drinkwater Bethune: Colonel John Drinkwater Bethune (9 June 1762 – 16 January 1844), born John Drinkwater, was an English army officer and military historian, and was well known for his journal, which he kept during the Great Siege of Gibraltar.

John Drinkwater (musician, technologist): John Drinkwater (born 1957 in Suffolk) American music writer.  Working for the BBC, he wrote the theme tune and incidental music for the award-winning children's drama series Dodgem.  He was musical director for The Bootleg Beatles from 1993–1995.  He made a major contribution to the Facing the Radio project (awarded the Radio Academy BT Award in 1995) and to Settling the Score.  His technological research includes musicDNA, an ontology and interface for mapping and navigating the musical universe, and the related iPhone app, musicGPS.

Abraham Lincoln (1924 film): Abraham Lincoln (1924) is a short film made in the Phonofilm sound-on-film process.  The film was directed by J. Searle Dawley, produced by Lee DeForest, is based on the 1918 play "Abraham Lincoln" by John Drinkwater, and stars Frank McGlynn Sr. as Lincoln.  McGlynn also played Lincoln in the play on Broadway.

Charles Sidney Gilpin: Charles Sidney Gilpin (November 20, 1878 – May 6, 1930) was one of the most highly regarded stage actors of the 1920s.  He played in critical debuts in New York City: the 1919 premier of John Drinkwater’s "Abraham Lincoln" and the lead role of Brutus Jones in the 1920 premier of Eugene O'Neill's "The Emperor Jones", also touring with the play.  In 1920 he was the first black American to receive the Drama League of New York's annual award as one of the 10 people who had done the most that year for American theater.

Garrison Library: The Garrison Library was founded in Gibraltar in 1793 by Captain (later Colonel) John Drinkwater Bethune.

Ivor Barnard: Ivor Barnard (13 June 1887 – 30 June 1953) was an English stage, radio and film actor.  He was an original member of the Birmingham Repertory Theatre, where he was a notable Shylock and Caliban.  He was the original Water Rat in the first London production of A. A. Milne's "Toad of Toad Hall".  In 1929 he appeared on stage as Blanquet, in "Bird in Hand" at the Morosco Theatre in New York, after a successful run in the London's West End (Laurence Olivier was the young juvenile).  The part had been specially written for him by John Drinkwater.

Supporting paragraphs: John Drinkwater (musician, technologist) The Bootleg Beatles
Answer: 1980