ans . ▁ ▁The ▁term ▁" B ird land " ▁is ▁commonly ▁used ▁to ▁refer ▁to ▁the ▁Baltimore ▁area ' s ▁fan base ▁for ▁both ▁the ▁Rav ens ▁and ▁the ▁Ori oles . ▁M AS N , ▁the ▁Ori oles ' ▁broadcast ing ▁network , ▁is ▁commonly ▁acc red ited ▁with ▁popular izing ▁this ▁term ▁thanks ▁to ▁their ▁prom os . ▁ ▁The ▁song ▁Seven ▁Nation ▁Army ▁was ▁popular ized ▁in ▁Baltimore ▁as ▁the ▁Rav ens ' ▁official ▁p ump - up ▁song . ▁Seven ▁Nation ▁Army ▁was ▁first ▁played ▁at ▁the ▁Rav ens ▁opening ▁game ▁of ▁ 2 0 1 1 ▁against ▁the ▁Ste el ers , ▁and ▁has ▁been ▁played ▁at ▁every ▁home ▁game ▁since . ▁It ▁can ▁often ▁be ▁heard ▁at ▁Ori oles ▁games ▁as ▁well , ▁with ▁fans ▁often ▁singing ▁the ▁signature ▁first ▁two ▁bars ▁of ▁the ▁song ▁as ▁" Oh ▁Oh ▁Oh ▁Oh ▁Oh ▁Oh ", ▁referring ▁to ▁the ▁O ' s ▁( Ori oles ) ▁ ▁Tour ist ▁attra ctions ▁ ▁American ▁D ime ▁Museum ▁( closed ▁February ▁ 2 0 0 7 ) ▁American ▁V ision ary ▁Art ▁Museum ▁B abe ▁Ruth ▁B irth place ▁Museum ▁Baltimore ▁Ghost ▁T ours ▁Baltimore ▁Mar itime ▁Museum ▁Baltimore ▁Museum ▁of ▁Art ▁Baltimore ▁Museum ▁of ▁Indust ry ▁Baltimore ▁Public ▁Works ▁Museum ▁( closed ▁February ▁ 2 0 1 0 ) ▁Baltimore ▁Street car ▁Museum ▁Bas il ica ▁of ▁the ▁National ▁S hr ine ▁of ▁the ▁Ass umption ▁of ▁the ▁B less ed ▁Virgin ▁Mary ▁B & O ▁Rail road ▁Museum