The word tocaban is the imperfect form of tocar in the third person plural.
See the full tocar conjugation

tocar

En el evento, muchas de sus obras se tocaban regularmente.
In the event, many of his works were played regularly.
Mejor que eso, ambos tocaban en la misma banda.
Better than that, you played in the same band.
Ella se acercó, sus pies no tocaban el suelo.
She came near. Her feet did not touch the ground.
Siempre puse músicos que tocaban bien, pero que eran desconocidos.
I always included musicians that played well, but who were unknown.
Se sentaban aquí y tocaban juntos durante horas.
They would sit here and play together for hours.
Escucha, he visto más monstruos de los que me tocaban.
Listen, I have seen more than my share of monsters.
Ese era el lugar donde el Cielo y la Tierra se tocaban.
That was the place where Heaven and Earth touched.
Todos tocaban el piano como divertimento, pero no como trabajo.
They all played the piano as a hobby, but not professionally.
Estaba nevando y nos preguntábamos por qué tocaban.
It was snowing and we wondered why they were playing music.
Pero cuando tocaban dinero, no sabían cómo manejarlo.
But when they touch money, they don't know how to handle it.
Pero solo a mirar, no tocaban nada.
But only to look, they didn't touch anything.
Cuando los portales se abrieron por la mañana tocaban tres veces.
When the gates were opened in the morning, they blew them three times.
Siempre sabía dónde tocaban las bandas clandestinas más guays.
He always knows where the coolest underground bands are playing.
Los prisioneros tocaban música para sí mismos incluso en los primeros campos de concentración.
Prisoners played music for themselves even in the early concentration camps.
Mi amigo Perry me dijo que tocaban aquí el martes.
You know, my friend perry Told me they're playing here Tuesday.
Por la tarde se tocaban las campanas por diez o quince minutos.
In the evening, the bells were rung for ten or fifteen minutes.
Como si ocurriera un reacción química cuando nuestros cuerpos se tocaban.
Like a chemical thing would happen when our bodies would touch.
Cada vez que tocaban a la puerta, pensaba que era el sheriff.
He thought that every knock on the door was the sheriff.
Las bandas tocaban por un nuevo Presidente.
The bands played for a new president.
Nunca vio bien, entonces, que la gente bailara mientras ellos tocaban.
He never saw with good eyes, then, that people danced while they played.
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