There are some of her concerts on Youtube. But if you don't want to listen to her music that is alright too. During one interview someone reported that she did not feel very comfortable using her own voice, although she used to be an classically-trained opera singer; she felt more connected to music only and did not use words too much, resulting her lyrics usually written by other people - although with her own intentions behind. Many people considered she was an extreme author in her own works. She often composed, arranged and orchestrated her own songs, used various disguised voices to describe the characters in stories behind those works.
She produced an album retelling Greek myths, nine muses and others fantasy world and symbolic-related. She even has a song called "Euridyce", with another instrumental score with some words on it, basically saying "The spirits of woods, they called me Eurydice (wife of Orpheus, tragic figures in Greek mythology)." I think she emerged herself with many tragic female heroines in stories, because she mostly sings about heart-broken girls who cannot find a place where she called home and truly belonged - yet she is so detached and shy when exerted those fantasies into her works.
Unfortunately I don't have any of her full interview, there are links to her live concerts. There are also some lyrics she wrote for songs (the White Cocoon of Dreams was written along with two others, Namino and Isogai, but I think her intention is still the strongest when it comes to writing lyrics). Doko e is purely her writing.
From "Doko e" (To where?)
Like a bird that forgot its home
I cannot even remember your figure...
Alone on the blood red hill
The footprints you left behind bring me pain
Just like being chained in memories
Memories of your unforgettable warmth
To where have you vanished?
The color of promise is fading, swept away by the wind
To the sky hazed in scarlet laments
Memories that echo in my ears
The ultramarine meadow has fallen asleep
To protect the dimly shining flowers
Along the path of faint sighs
To where have you gone?
In order to bring back those wailing warmth
I chase after you with my tired feet, I want for you with my painful heart
I whisper, I sing, I search for you
Can we ever meet again?
[Credits (translated): Aquagon]
From "White Cocoon of Dream (Remembering the Past)"
Oh ephemeral soul,
that hide yourself
in the depths of deceit,
who have you waited for
in the deserted forest?
Deprived of a wing,
the tiny bird has
closed its eyes in silence.
The sufferance
has vanished far away;
the tiny bird
now cries no more.
A silvery soft mist,
a silvery soft mist
tenderly envelops everything.
Rest, rest in peace:
in the tale I've wrote,
you can freely fly.
Here's my last spell,
so that your light
shall not know darkness (darkness...)
May the splendid (splendid) golden dream
never be befouled (befouled)
by the sadness (sadness)
brought by the truth (the truth)
The forest of guilt,
that consumed the tiny bird,
has withered in silence.
Fallen petals in the wind
gently wrap
the pale cheeks.
That day, how many mysteries
should I have solved
to take you away?
Rest, rest in peace:
in the illusion you created,
I knew love.
I shall never cease
pronouncing your name,
to keep bringing to life your desires!
Nor no one nor nothing may
drag you into the darkness of the oblivion.