Rhinoplasty - Deviated Septum - Singing Voice?

  The septal repair may change the quality to some degree.  Hypernasal causes to speech can be palatal issues, like cleft palate.

A rhinoplasty is done for purely cosmetic reasons and is paid for by the patient.  A deviated septum repair is done for purely functional reasons.  The combination of septorhinoplasty can certainly be done together in the same setting under general anesthesia.  Repairing a deviated septum will make the voice sound less nasal and will have more resonance so it is certainly acceptable to repair that at the same time.  Repairing a deviation of the nasal septum usually improves the singing voice whether it be an amateur or professional voice.