On the album the introducing words for each song are at the end of the previous song, so when listening to the previously mentioned song you'll also hear the spoken text that comes with the next song on the album, which is a great tune as well.

So here is The Bardcall

https://www.youtube.com/watch?v=IvajtyyAN-s

The lyrics:

Winds will change and skies will fall when the bards arrive. When the bard's call sounds out loud we all feel so alive. Earth will shake and fires burn when the bards unite. When the bard's call sounds out loud we're so alive tonight. From eight parts of our sacred lands we shall gather now! From each of our eight continents we'll find our way somehow. It's been foretold. It's destiny that we shall meet again. To recreate this melody that had once been banned. Into battle, one against four. Our world is what we are fighting for! Four of them are at our side. Dragons - spread your wings! Annihilate the dark one's might. History begins! Into battle, one against four. Into the black eye of a storm! Into battle, one against four. With Voices of fire we swore.

There are two songs on Voices of Fire that feature the male lead singer and female lead singer singing slightly different text at more or less the same moment.
It is beautiful.

One of those two songs is We Are One.

https://www.youtube.com/watch?v=wIxaHc8L17w

As song text is not provided on YouTube, I'll quote it here, using the format from the booklet, which does not differentiate between the two leads.

I love how they often sing identical syllables of their text at the same time.

Love - Hatred. Hearts at war. Hope - Sorrow. Hearts apart. I'm a man who used to live in hiding. Fear can't seize my heart anymore. I'm a bard. Can feel my spirits rising. Nothing's like before. Our fate has come to light. Our love's delight. Light will lead us through the night. Tonight I'll shine for you. I wish you will sing. You will shine when I will sing for you. I can't shine without your voice. Can't be without you too long. You've been with me all along. I will sing for you and me. Oh sing - you and me, we do belong. We are one. Together we're one. You make me a better man. Believe in who I am. My heart beats at your command, I put it in your hands. Let's turn this into our song. I never felt that strong. Our love is a mighty one. Let's go on a dragon hunt! Our fate has come to light. Let's seal our fate tonight! Seals can break in two. Our love will see us through. Tonight I'll shine for you. I wish you will sing. You will shine when I will sing for you. Sweet wings of love take me up to stars above. His voice in sooth makes me shine a thousand lights.