The word tocabais is the imperfect form of tocar in the second person plural.
See the full tocar conjugation

tocar

Tú y Ethan no solo tocabais en una banda juntos, ¿verdad?
You and Ethan didn't just play in a band together, did you?
Si tenías tiempo, os conocíais y tocabais juntos.
If you had time, you'd meet up and play together.
¿Me estás diciendo que tocabais ustedes?
You're telling me it was really you playing?
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