You could just turn the sound down. 😀
Anyway. . .
If the subtitles in the trailer for "Those Snow White Notes" posted above appear a little strange, I take it that the Crunchyroll people were attempting to approximate an English equivalent of a Japanese "provincial" dialect and accent.
Setsu is a "country boy", from the Tsugaru peninsula at the northern tip.of Honshu, where, in fact, the Tsugaru shamisen style originated in the 19th century. This style is more percussive than traditional shamisen, with the player often striking the skin of the instrument; it's also louder, and emphasizes improvisation more than the older styles. It is generally considered to have been started by blind street musicians, and as someone who grew up in the Blue Ridge
Mountains, I can't help seeing parallels to the Bluegrass banjo, in both sound and style. If you've ever seen blind street musicians playing the banjo, you'll know what I mean.
In the series, Setsu is a teenage boy who lives for his grandfather's music, but after whose death, decides to drop out of high school and move away from the memories.
He nearly gives up the shamisen, but circumstances find him onstage, trying to entertain an audience of young people, until the rock musician they came to see recovers from a temper tantrum. Just imagine going to see your favourite fill-in-the-blank hot rockstar, and having a hillbilly banjo picker come out instead.