Korea - historical photographs

After long time seeking and asking today I was first time successful. Finally I found some quite old Korean Photos. The age of such photos is in most cases still unclear for me, I have to learn how to recognize.  

Private photo, original 156x111 mm, cropped and cleaned digitally. Japanese handwriting on the backside not yet translated. Japanese Girl-Band with Western instruments, prosumably 1920s according the hairstyle.

Private photo, original 135x94 mm, cropped and cleaned digitally. Probably before 1900. Japanese handwriting on the backside says 'Traditional Korean man'. 

Private photo, original 76x56 mm, cleaned digitally. About 1960's years. Japanese handwriting on the backside, probably a poem not yet translated. The drum is a Janggu.

Private photo, original 82x60 mm, cropped and cleaned digitally. Japanese handwriting on the backside says 'Changan Sa' temple at the 'Kon Gang Sam' mountain, today in North Korea.

Private (?) photo, original 153x110 mm, cropped and cleaned digitally. Printed Japanese description partly translated and locates it to Chang Kyung Palace, Seoul. The two men in the foreground are married, this can be recognized by wearing those high hats. The long part in ones hand is a pipe. The length of the pipe indicates the social status as well the diameter of the hat brim, those appearances show middle-sized status in this case. The white clothes were distinctive for Koreans and these men wear shoes made of rice-stems.