Shinobi 101 Genjutsu (Photon) --> Shinobi 101 Genjutsu (Sound)
It was easy enough to make the switch. With the ability to use her voice to cast genjutsu through song, using her mental faculties to manipulate sound was simply the reverse. In fact, it was vastly easier than trying to manipulate light with just her mind. Singing came naturally to the performer, Tama just had to run a song through her head she could hear it humming around her, though she herself was silent. And others could hear it too, she had confirmed this by sitting in her brother's room completely silent while her thought-music creepily played around the room.It had driven Tomo nuts, and greatly amused the chuunin.
In contrast, when she was doing the same thing with light Tama had to focus much more. One would think that light and illusions go hand in hand, but for Tama this was not the case. Usually someone backstage did the lighting and set the scene, and while Tama could use these effects, creating them was not her forte. However, whether performing song or prose, Tama contributed to the illusion of stagecraft with her voice more often than not. Thus in her mind sound and illusions were associated together more than light could ever be.
In contrast, when she was doing the same thing with light Tama had to focus much more. One would think that light and illusions go hand in hand, but for Tama this was not the case. Usually someone backstage did the lighting and set the scene, and while Tama could use these effects, creating them was not her forte. However, whether performing song or prose, Tama contributed to the illusion of stagecraft with her voice more often than not. Thus in her mind sound and illusions were associated together more than light could ever be.