https://twetch.app/t/1ac60fb2bafbf2723691e760e45287729d9da2…

https://twetch.app/t/1ac60fb2bafbf2723691e760e45287729d9da212e38e84403bb4c8be18149411
A harmonic is any member of the harmonic series, an ideal set of frequencies that are positive integer multiples of a common fundamental frequency.