Most music ed degrees require you to chose between vocal/choral and instrumental. You must audition on an instrument or in voice, and that will require a demonstration of some level of technical achievement on your instrument and/or talent in singing. Most middle and high school level music programs have separate choral and instrumental (band and string) instructors. Elementary music teachers must have some vocal and keyboard background. All will need to pass some degree of piano proficiency. Instrumental music ed majors will have to take "methods" courses in the categories of instruments outside their major, for instance if they play the trumpet, they will take a brass methods course, a string methods course, and a woodwinds methods course. The curriculum will require you to play all of the instruments well enough to teach a beginner. Some schools will require a higher level of proficiency in a music education audition than others, it depends on the general level of the music school. Good luck.