estaban entonando
Imperfect progressive ellos/ellas/ustedes conjugation of entonar.

entonar

Las esferas danzantes del Sr. Pitágoras estaban entonando melodiosamente cuando un hombre modesto nació.
The dancing spheres of Mr. Pythagoras were humming melodiously and a modest man was born.
Los granjeros Dragón estaban entonando un mantra de fortaleza, permitiendo que fuese capaz de soportar las oleadas de dolor que recorrían su cuerpo.
The Dragon peasants were chanting a mantra of strength, willing him their ability to withstand the wracking spasms of pain that coursed through his body.
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