Guards' Band playing and marching across courtyard - at Horseguards?
Guards' Military band playing in front of large building - could be Horseguards? Guards in FG marching & playing music; w/ front of palace in BG. Then; masses of guards march in long rows; with front diag. view of Palace. (People on balcony in BG; royalty?)
Pomp; buildings; London. England. tradition; antiquities.