The word canté is the preterite form of cantar in the first person singular.
See the full cantar conjugation

cantar

Es cierto, canté una canción y los Daleks huyeron.
That's right, I sang a song and the Daleks ran away.
Me puse delante de un público y canté.
I got up in front of a crowd and sang.
No, pero... viniste a verme después de que canté para ti.
No, but... you came to see me after I sang for you.
Nunca antes canté una canción con alguien más.
I never sang a song with someone else before.
Desde que canté aquella canción, es algo que me persigue.
Ever since I sang that song, it's been haunting me.
Una vez después de leer su correo electrónico, canté intensamente.
Once on reading your email, I chanted intensely.
Estaba allí, canté la canción, todo parecía ser...
She was there, I sang the song, everything seemed to be...
Aún no puedo creer que canté en el Bluebird.
I still can't believe I sang at the Bluebird.
Javier escribió la canción, pero yo la canté.
Javier wrote the song, but I sang it.
Dijo que canté con toda mi alma.
He said I sang with all my soul.
Es la última caja y ya canté que eran míos.
That's the last box, and I had dibs on them.
Oh, ¿Por qué canté eso en voz alta?
Oh, why did I sing that out loud?
Esa es una de las canciones que canté.
That was one of the songs I sang.
Me subí al bar y le canté a todos.
I got up on the bar and I sang to everyone.
Pero no canté la parte con las bengalas.
But I didn't do the part with the sparklers.
Con gran audacia, para una persona de mi temperamento, le canté.
With great audacity, for a person of my temperament, I sang to him.
Solo canté para ocultar el hecho de que no estabas allí.
I only sang to cover for the fact that you weren't there.
¿Sabes qué canté para mi cumpleaños?
You know what I sang for my birthday?
Entonces la canté al grupo varias veces.
Then I sang it to the group several times.
Tu gracia, ¿cómo supiste esa canción que te canté?
Your grace, how did you know that song that I sang to you?
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