hi! i know you play clarinet as your primary instrument and i do too! i am about to enter my senior year of high school and have begun to consider music therapy as a career! i know you have to learn various instruments for this career path but is it okay if you only know your primary instrument when entering into school for this degree? will it be relatively easy to learn these instruments as well as improve your aural skills?
I would definitely work on learning some guitar and piano before you apply for school! You can take classes in your program but it will make it a lot easier if you already have a super basic understanding.