▁original ▁compos itions , ▁Burn s ▁also ▁collected ▁folk ▁songs ▁from ▁across ▁Scotland , ▁often ▁revis ing ▁or ▁adapt ing ▁them . ▁His ▁poem ▁( and ▁song ) ▁" A uld ▁Lang ▁Sy ne " ▁is ▁often ▁s ung ▁at ▁Hog man ay ▁( the ▁last ▁day ▁of ▁the ▁year ), ▁and ▁" Sc ots ▁Wh a ▁H ae " ▁served ▁for ▁a ▁long ▁time ▁as ▁an ▁uno fficial ▁national ▁anth em ▁of ▁the ▁country . ▁Burn s ' s ▁poetry ▁drew ▁upon ▁a ▁substantial ▁familiar ity ▁with ▁and ▁knowledge ▁of ▁Class ical , ▁Bib lic al , ▁and ▁English ▁literature , ▁as ▁well ▁as ▁the ▁Scottish ▁Mak ar ▁tradition . ▁Burn s ▁was ▁sk illed ▁in ▁writing ▁not ▁only ▁in ▁the ▁Sc ots ▁language ▁but ▁also ▁in ▁the ▁Scottish ▁English ▁dialect ▁of ▁the ▁English ▁language . ▁Some ▁of ▁his ▁works , ▁such ▁as ▁" L ove ▁and ▁Liber ty " ▁( also ▁known ▁as ▁" The ▁J olly ▁Beg g ars "), ▁are ▁written ▁in ▁both ▁Sc ots ▁and ▁English ▁for ▁various ▁effects . ▁His ▁them es ▁included ▁republic an ism , ▁radical ism , ▁Scottish ▁patri ot ism , ▁ant ic ler ical ism , ▁class ▁in equal ities , ▁gender ▁roles , ▁comment ary ▁on ▁the ▁Scottish ▁Kirk ▁of ▁his ▁time , ▁Scottish ▁cultural ▁identity , ▁pover ty , ▁sexual ity , ▁and ▁the ▁benef icial ▁aspects ▁of ▁popular ▁social ising . ▁ ▁Marg inal isation ▁ ▁Scottish ▁poetry ▁is ▁often ▁seen ▁as ▁entering ▁a ▁period ▁of ▁decl ine ▁in