thats fine.Being a new SONE takes some time to know who looks what [before+after makeup], birthdates, past stories before debut, peevs, etc etc etc.
So wait a minute, you have problems telling them or their voices apart? The reference to lyrics confused me.
SONE = its what fans of snsd are called.pronounced as soh-one [if im not mistaken, fans are called that since their 'Genie' days]