FANTASY CHAR IDEA :333

Okiee so this kinda plays into sound and music a bit which I prolly dunno a TONNN Abt but I'm still gonna talk about it :3 Imagine you have a fairly balanced magician, nothing big to write home about...HOWEVER....they are also a Musician, and with their instrument(s), they can use sound frequencies in order to shatter magic constructs or tools. So if an enemy were to use something like, a crystal imbued with natural energy as a sword, our Musical Magician could nullify the blade or even make it shatter; like how a high note can shatter a glass. This type of countering would have to take YEARS to perfect however, since magic items would work in a different way to ordinary glass obviously. But it also means the counter, would be hard to counter. The enemy would either have to protect their magic from sound/air COMPLETELY, or just not use it in general, putting them at a major disadvantage OR, the enemy would have to also learn how frequencies affect their magic and(this part's a bit iffy-I'm not too knowledgeable) have to play the OPPOSITE frequency to cancel out the first's. You could either make this user a character(though make them midway into testing out their theory) to play as, OR, an enemy that you can use to show the protagonist's BIQ or Improvisation Skills :3 ....at least that's the best way I can come up with to use them..... Let me know any thoughts you have!!!