In all cases, illness is caused by the botulinum toxin produced by the bacterium C. botulinum in anaerobic conditions and not by the bacterium itself. The pattern of damage occurs because the toxin affects nerves that fire (depolarise) at a higher frequency first.
BMT (Bachelor of Music Therapy) Voice majors in this degree often have music skills and an interest in the science and medicine. Future vocal music majors are often the top singers in their high schools. It is not unusual for talented teens to sing a variety of vocal styles in high school.
In addition to singing, singers may work as music teachers or voice coaches. Professional singers are highly talented and have an excellent ear for identifying tone and pitch. Singers often freelance and are contracted on a per job basis, either as a singer or as a consultant or judge in singing competitions.