I love the idea of a Bard and read various books when I was in my high fantasy reading phase where they were primary magic users, not support, using both voice and instrument.
So, as a primary magic user class, and with both a back story and an introductory story that would bring them into the World in an organic manner (like a hidden sleeping Titan/God/Something of prophecy awakes due to freakin’ sword sticking out of the planet to teach the worthy this special music magic to deal with it and heal the wound), I wouldn’t have a problem with it.
Oh, they would be open to every race, wear leather and have a great dance 
!
Also this idea is already being explored here, along with Tinker and Necromancer: