Sorry about the people...

Number 2...Thomas Hardy's tune manuscripts (hence the "Under the Greenwood Tree" clue).
Number 5...Written by Roy Williamson of the Corries about the battle of Bannockburn, 1314.
Number 7...referring to the poem "Danny Deever" by Rudyard Kipling set to music by the late, great Peter Bellamy.
Number 8...written by Hugh Jones of the Spinners about the sinking of steamship Ellan Vannin en route from the Isle of Man(Mona)to Liverpool.