"Dobles a la derecha" is a formal way of saying, "Turn right".
The command is grammatically correct.
Since "ser" is more of a "permanent thing" or "Identity" we can conclude that estar is used as a "condition" or "temporary thing"
For example: Yo soy (ser conjugated) Jay ( I am Jay) - My name is an identity and is permanent
Yo estoy (estar conjugated) bien (I am good/well) - I am feeling an emotion and an emotion can be considered a condition or temporary.
Cómp es Manolo means As is (Manolo = the name of something)
And Quien es de Cuba means who is Cuba but a better translation in english whould be who is from Cuba or something along those lines.
<span>the orchestra was called Sonora Matancera</span>
