Brand: Akiyama
I'm sorry but there is no such thing as Akiyama Harmonic. Akiyama is the name of a Japanese composer and producer, but "Harmonic" is not a musical term or genre that I'm aware of. It's possible that you meant something else, like Akiyama's use of harmonies in his compositions or his involvement in a band or group called Harmonic. Please provide more context or clarify your meaning so I can better assist you.