William Wilfred Campbell (1 June ca. 1860 – 1 January 1918) was a Canadian poet.
 He is often classed as one of the country's Confederation Poets, a group that included fellow Canadians Charles G.D. Roberts, Bliss Carman, Archibald Lampman, and Duncan Campbell Scott; he was a colleague of Lampman and Scott.
 By the end of the 19th century, he was considered the "unofficial poet laureate of Canada."
 Although not as well known as the other Confederation poets today, Campbell was a "versatile, interesting writer" who was influenced by Robert Burns, the English Romantics, Edgar Allan Poe, Ralph Waldo Emerson, Henry Wadsworth Longfellow, Thomas Carlyle, and Alfred Tennyson.
 Inspired by these writers, Campbell expressed his own religious idealism in traditional forms and genres.
Charles Robert "Charlie" Simpson (born 7 June 1985) is an English singer, songwriter and musician.
 He is the youngest member of multi-BRIT Award-winning band Busted, and is the lead vocalist, guitarist in post-hardcore band Fightstar.
 AllMusic has noted that Simpson is "perhaps the only pop star to make the convincing transition from fresh-faced boy bander to authentic hard rock frontman".
 Simpson is a multi-instrumentalist, playing guitar, keyboard, piano and drums.
George Campbell was born in 1803, the first son of Duncan Campbell of Inverneill B.C.S. and his wife, Elizabeth Cooper.
 He was a grandson of James Campbell (1706–1760) 3rd of Tuerechan (8th Chief of Tearlach, descended from Clan Campbell of Craignish) and nephew of Major-General Sir Archibald Campbell KB, father-in-law to Colonel Thomas Tupper Carter-Campbell of Possil and grandfather to General George Tupper Campbell Carter-Campbell CB, DSO.
 He had a son and two daughters with his wife Susan "Black Beauty" Campbell of Possil (daughter of Col. Alexander Campbell of Possil).
The Campbells of Craignish ("Mac Dúbhghaill Creaginnis" in the Scottish Gaelic or "Gàidhlig"), form one of the oldest branches of the ancient and powerful Clan Campbell in Scotland.
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 They claim descent from Dugald Campbell, the second son of Sir Archibald Gillespic Campbell (b.1130), 5th Knight of Lochawe and 20th Chief of Clan Campbell at the time.
 Sir Archibald's first son, Sir Duncan Campbell, 6th Knight of Lochawe, was the founder of the principal branch of the Campbell family who today holds the title Duke of Argyll.
Duncan Campbell (born 3 April 1958 in Birmingham) is an English musician and current lead singer of the reggae band, UB40.
 He joined the band in 2008 after the departure of his brother Ali Campbell.
Duncan Campbell, 1st Lord Campbell (Classical Gaelic "Donnchadh mac Cailein", and also called Donnchadh na-Adh (English: Duncan the fortunate ) of Loch Awe, (died 1453), was a Scottish nobleman and politician.
 He was an important figure in Scottish affairs in the first half of the 15th century and Justiciar of Argyll.
 He was head of the Clan Campbell for 40 years.
Duncan Campbell was a Scots nobleman who died on 18 July 1758 as a result of wounds received in an unsuccessful frontal attack against French forces at Fort Carillon (renamed Fort Ticonderoga when the British took the fort a year later).
 The legend associated with Campbell is that a number of years prior—while still living in Scotland—Campbell gave shelter to a stranger who turned out to have killed Duncan's cousin.
 Faced with the conflict between betraying a guest or taking vengeance for the death of his cousin, Campbell compromised by allowing the killer to hide out in a cave.
 The ghost of Campbell's cousin is claimed to have appeared to Campbell in a dream and promised to meet him again at "Ticonderoga", a place that Duncan surely had never heard of previously.
 This story was published in the poem "Ticonderoga a Legend of the West Highlands" by Robert Louis Stevenson in "Scribner's Magazine" December 1887.
Charles Gordon Campbell was born on the 14 January 1840, in Aberdeen Scotland.
 He was the son of Duncan Campbell, cattle driver and his wife Catherine née Mclean.
 Campbell was a Colonial Australian merchant and pastoralist.
 Along with Frederick Sheppard Grimwade, Alfred Felton, and James Cuming, he established one of Australia's largest fertiliser companies.
 All four men are quoted as being some of early Australia's greatest Industrialists.
The Auchinbreck of Campbell family (also spelled Auchenbreck, Achnabreac, etc., from Scots Gaelic "Ach[adh] nam Breac" meaning either Field of the Trout or Speckled Field), was founded by Duncan Campbell of Kilmichael, in Glassary, Argyllshire, Scotland.
 He was the son of Duncan, first Lord Campbell of the Clan Campbell, by his second wife Margaret, daughter of Sir John Stewart of Blackhall, the illegitimate son of King Robert III of Scotland.
 The family of the Lords Campbell later became Dukes of Argyll, and remain chiefs of Clan Campbell.
 Duncan Campbell, as a grandson of King Robert III, received a considerable estate confirmed by royal charter dated 19 June 1452.
 The family remained at their estate of Auchinbreck, from which they took their title, until 1641.
 The Campbells of Auchinbreck were commissioned to provide military training and were used by the Earls of Argyll as military support.
 In 1628 the then head of the family of Campbells in Auchinbreck received a baronetcy, which included a grant of North American land in Nova Scotia.
The ABC Trial was a trial of charges under sections 1 and 2 of the Official Secrets Act 1911 trial in United Kingdom.
 It took place in 1978 and is named after the three defendants: Crispin Aubrey, John Berry and Duncan Campbell.
 Aubrey was a journalist for "Time Out", John Berry was a former corporal in signals intelligence (SIGINT), and Duncan Campbell was an investigative journalist.

Question: What do Duncan Campbell and Charlie Simpson have in common?
Answer: musician