Here are some ways you can reply:
If you sing in the choir:
* Sí, canto en el coro de la escuela. (Yes, I sing in the school choir.)
* Sí, me gusta cantar en el coro. (Yes, I like singing in the choir.)
* ¡Claro que sí! Me encanta cantar. (Of course! I love singing.)
If you don't sing in the choir:
* No, no canto en el coro. (No, I don't sing in the choir.)
* No, pero me gustaría aprender a cantar. (No, but I would like to learn how to sing.)
* No, prefiero tocar otro instrumento. (No, I prefer to play another instrument.)
To add more detail:
* Sí, canto en el coro de la escuela. Cantamos [mention a specific song or genre]. (Yes, I sing in the school choir. We sing [mention a specific song or genre].)
* No, no canto en el coro, pero me gusta escuchar música. (No, I don't sing in the choir, but I like to listen to music.)
Remember to adjust the response to your personal situation and preferences!