That's discussed a few times in the first book - in the scenes with Strigan and with Anaander Mianaai in particular.
One of Justice of Toren's captains long ago had a taste for music and asked One Esk to sing for her, and One Esk developed an interest in music, and that was what started differentiating it from Justice of Toren. The progressive faction of Anaander Mianaai noticed that and recognised it as a similarity to the division in herself, and also as a potential advantage to exploit. That's what gave her the idea to ask One Esk to teach her a song, and use that as the trigger for her accesses.
no subject
That's discussed a few times in the first book - in the scenes with Strigan and with Anaander Mianaai in particular.
One of Justice of Toren's captains long ago had a taste for music and asked One Esk to sing for her, and One Esk developed an interest in music, and that was what started differentiating it from Justice of Toren. The progressive faction of Anaander Mianaai noticed that and recognised it as a similarity to the division in herself, and also as a potential advantage to exploit. That's what gave her the idea to ask One Esk to teach her a song, and use that as the trigger for her accesses.