== Song categories == 

 Subcategorizing All Category:Singles by years are subcategories of Category:Songs by year categories. Consequently, anything in (e.g.) Category:1957 singles is in Category:1957 songs. Since articles should not be in parent as well as subcategories simultaneously, I am removing these redundant categories. Please respond on my talk if you would like to continue this matter. —❤☮☺M☯