The answer to the question: What major world event led to Denmark seeing the man who wrote over 290 songs as someone who created "shining jewels in our treasure chest" is inside the article: Over the years, Nielsen wrote the music for over 290 songs and hymns, most of them for verses and poems by well-known Danish authors such as N. F. S. Grundtvig, Ingemann, Poul Martin Møller, Adam Oehlenschläger and Jeppe Aakjær. In Denmark, many of them are still popular today both with adults and children. They are regarded as "the most representative part of the country's most representative composer's output". In 1906, Nielsen had explained the significance of such songs to his countrymen:With certain melodic inflections we Danes unavoidably think of the poems of, for example, Ingemann, Christian Winther or Drachmann, and we often seem to perceive the smell of Danish landscapes and rural images in our songs and music. But it is also clear that a foreigner, who knows neither our countryside, nor our painters, our poets, or our history in the same intimate way as we do ourselves, will be completely unable to grasp what it is that brings us to hear and tremble with sympathetic understanding. Of great significance was Nielsen's contribution to the 1922 publication,  Folkehøjskolens Melodibog (The Folk High School Songbook), of which he was one of the editors together with Thomas Laub, Oluf Ring and Thorvald Aagaard. The book contained about 600 melodies, of which about 200 were composed by the editors, and was intended to provide a repertoire for communal singing, an integral part of Danish folk culture. The collection was extremely popular and became embedded in the Danish educational system. During the German occupation of Denmark in World War II, mass song gatherings, using these melodies, were part of Denmark's "spiritual re-armament", and after the war in 1945 Nielsen's contributions were characterised by one writer as "shining jewels in our treasure-chest of patriotic songs". This remains a significant factor in Danish assessment of the composer., can you guess it ?
Ans: World War II

The answer to the question: What is the name of the church to which galleries were added in the 18th century? is inside the article: A diocesan return of 1563 recorded 145 households in the parish of New Sleaford, while the Compton Census (1676) reveals that New Sleaford had a Conformist population of 576 people, no "Papists", and 6 Non-conformists. There is a widely held local tradition that St Denys' was used during the English Civil War (1642–51) as a barracks for parliamentary troops  who destroyed the interior furnishings. The local historian Trollope stated that the soldiers looted the brass eagle lectern (last recorded in 1622), broke the stained glass windows and the organ, and stole valuables. Whether this damage occurred or not, repairs to the windows and roof were carried out in 1657, paid for by public subscription. Galleries were also added to the church in the 18th century: the south in 1758, west in 1772, and north in 1783–84. In 1772, Edward Evans, a ship's surgeon on HMS Egmont, donated £300 to replace the organ with one built by Samuel Green of London.For most of the 19th century, the Anglican community dominated Sleaford's civic bodies, including the Board of Guardians, who oversaw the workhouse, and the Local Board of Health. Dr Richard Yerburgh and his son, Richard, were vicars in 1809–51 and 1851–82 respectively and had family connections with the local builders Kirk and Parry; Yerburgh and Thomas Parry (one half of the firm) were on the Board of Guardians and were labelled members of a "family party" by opponents during the Board's 1870 elections (they were nonetheless re-elected). They and other local clergymen were key players in the establishment of National schools in Sleaford and Quarrington, which Kirk and Parry built. The Anglican congregation, at an estimated 700 to 800 people in 1851 (St Denys' had enough space for 743 people), was less than half of the size of the nonconformist community, which was probably larger than 2,000 and tended to flourish in poorer parts of the town.The 19th century also witnessed two major restorations to St Denys'. As the congregation expanded, the need for greater space was met..., can you guess it ?
Ans: St Denys'

The answer to the question: What is the name of the person that is made into a statue in the grotto? is inside the article: With the garden project well in hand, Ammanati turned his attentions to creating a large courtyard immediately behind the principal façade, to link the palazzo to its new garden. This courtyard has heavy-banded channelled rustication that has been widely copied, notably for the Parisian palais of Maria de' Medici, the Luxembourg. In the principal façade Ammanati also created the finestre inginocchiate ("kneeling" windows, in reference to their imagined resemblance to a prie-dieu, a device of Michelangelo's), replacing the entrance bays at each end. During the years 1558–70, Ammanati created a monumental staircase to lead with more pomp to the piano nobile, and he extended the wings on the garden front that embraced a courtyard excavated into the steeply sloping hillside at the same level as the piazza in front, from which it was visible through the central arch of the basement.  On the garden side of the courtyard Amannati constructed a grotto, called the "grotto of Moses" on account of the porphyry statue that inhabits it. On the terrace above it, level with the piano nobile windows, Ammanati constructed a fountain centered on the axis; it was later replaced by the Fontana del Carciofo ("Fountain of the Artichoke"), designed by Giambologna's former assistant, Francesco Susini, and completed in 1641.In 1616, a competition was held to design extensions to the principal urban façade by three bays at either end. Giulio Parigi won the commission; work on the north side began in 1618, and on the south side in 1631 by Alfonso Parigi.  During the 18th century, two perpendicular wings were constructed by the architect Giuseppe Ruggeri to enhance and stress the widening of via Romana, which creates a piazza centered on the façade, the prototype of the cour d'honneur that was copied in France.  Sporadic lesser additions and alterations were made for many years thereafter under other rulers and architects.To one side of the Gardens is the bizarre grotto designed by Bernardo Buontalenti. The lower façade was begun by..., can you guess it ?
Ans: Moses