The Swallow Song is a folk-music song written in 1964 by Richard Fariña.
 It was likely based on Dimitrie Cantemir's "Los Paxaricos", which contains an identical melody.
 The song was recorded on Richard & Mimi Fariña's second LP, 1965’s "Reflections in a Crystal Wind " and was included on Joan Baez's 1995 album "Ring Them Bells".
In condensed matter physics, the probability of occupation shows how likely it is for a given energy level to be occupied.
 Fermions such as electrons follow a Fermi–Dirac distribution and bosons such as phonons and photons follow a Bose–Einstein distribution.
The Latin American Wars of Independence were the revolutions that took place during the late 18th and early 19th centuries and resulted in the creation of a number of independent countries in Latin America.
 These revolutions followed the American and French Revolutions, which had profound effects on the British, Spanish, Portuguese and French colonies in the Americas.
 Haiti, a French slave colony, was the first to follow the United States to independence, during the Haitian Revolution, which lasted from 1791 to 1804.
 From this emerged Napoleon Bonaparte as French ruler, whose armies set out to conquer Europe, including Spain and Portugal in 1808.
 The Peninsular War, which resulted from the Napoleonic occupation of Spain, caused Spanish Creoles in Spanish America to question their allegiance to Spain, stoking independence movements that culminated in the wars of independence, which lasted almost two decades.
 At the same time, the Portuguese monarchy relocated to Brazil during Portugal's French occupation.
 After the royal court returned to Lisbon, the prince regent, Pedro, remained in Brazil and in 1822 successfully declared himself emperor of a newly independent Brazil.
Been Down So Long It Looks Like Up to Me is a novel by Richard Fariña.
 First published in the United States in 1966 the novel, based largely on Fariña's college experiences and travels, is a comic picaresque story that is set in the Western United States, in Cuba during the Cuban Revolution, and at an upstate New York university.
 The name of the protagonist is Gnossos Pappadopoulis, a modern Odysseus.
 The book has become something of a cult classic among those who study 1960s or counterculture literature.
332nd Engineer General Service Regiment or 332nd Engineer Regiment was activated as a Special Service Regiment in May 1942, as a unit in the United States Army.
 Later this unit was redesignated a General Service Regiment.
 The unit was formed from some regular Army officers and enlisted men, trained in the United States, then shipped overseas early in World War II to England.
 They were the vanguard of many others to follow, including infantry and armored troops.
 Their purpose was to build facilities in preparation for those to follow.
 After the Normandy Invasion, they followed the front lines constructing roads, railroad bridges, hospitals, and other infrastructure needed by the advancing Armies.
 Continuing through until surrender by Germany in 1945, the unit stayed on as part of the Army of Occupation.
 Many of the troops in the units were among those who were overseas for the longest periods of all in World War II.
Grażyna Miller (29 January 1957 – 17 August 2009) was a Polish poet and translator who lived in Italy.
Joan is a 1967 album by Joan Baez.
 Having exhausted the standard voice/guitar folksong format by 1967, Baez collaborated with composer Peter Schickele (with whom she'd worked on the 1966 Christmas album, "Noël"), on an album of orchestrated covers of mostly then-current pop and rock and roll songs.
 Works by Donovan, Paul Simon, Tim Hardin, the Beatles, and Richard Fariña were included, as well as selections by Jacques Brel and Edgar Allan Poe.
Richard George Fariña (March 8, 1937 – April 30, 1966) was an American folksinger, songwriter, poet and novelist.
Follow the Boys (1963) is a comedy film starring Connie Francis, Paula Prentiss, and Janis Paige, and released by Metro-Goldwyn-Mayer.
 Directed by Richard Thorpe and shot on location on the French and Italian Riviera, "Follow the Boys" was MGM's second film vehicle for top recording artist Francis following "Where the Boys Are" (1960).
 While Francis' role in the earlier film had been somewhat secondary, she had a distinctly central role in "Follow the Boys" playing Bonnie Pulaski, a newlywed traveling the Riviera.
"Birmingham Sunday" is a song written by Richard Fariña and performed by both Fariña and his sister-in-law Joan Baez.
 The subject matter is the bombing of the 16th Street Baptist Church in 1963 by members of the Ku Klux Klan that killed four girls and injured 22 others.

Question: Which occupation do both Grażyna Miller and Richard Fariña follow ?  
Answer: poet