Fun fact: the AKG K-701 headphones that Mio wears received a big boost in sales when K-On! aired and retailers unofficially named it the "the Mio-phone" : r/k_on
K-ON! economic effect? Massive lift on the sales of expensive headphones worn by the lead - GIGAZINE
All Japanese Music Theory Videos On Youtube ⋆ Chromatic Dreamers