Yes, if you convinced a lot of people to transact in cans of beans, you would be undermining the control of the government. Just look at countries that don't have a (viable) currency. They are using dollars or euros and are subject to a foreign powers monetary policy.
Also no country defines sovereignty through voluntary consent. Laws applies to you whether you agree or not.
Democracy, as opposed to oligarchy, is where the people are ultimately sovereign.
Sure, laws apply to the ones disagreeing, but in theory, the government serves the people, not rules it.
Central banks however, have a large amount of control over everyone's financial life, yet the signal from voting is only very dimly forwarded to this institution, and there are limited checks and balances governing it.
Would be pretty easy to do in this eastern EU country. We have laws that require stations to separate ads from content, so there is always a short animation announcing the start and end of ads.
All of it matters, as a lot of what you find enjoyable about music is learned. Today's music might sound dissonant to someone a few hundred ago. Eg. a particular interval the _tritone_, also known as the devil's tone was considered particularly unpleasant before, but is now ubiquitous. Even today you might find music with 12+ tones not enjoyable (try listening to Indian or Middle Eastern scales).
To understand what the physical fundamentals are, think of a taught piece of string that produces a note when you pluck it. The length of it is arbitrary (frequency), what you call this note is arbitrary (letters, sharps, flats etc.). But if you start cutting the string and compare the note it makes to the original, that _ratio_ of strings (frequencies) is a fundamental property of sound and the basis of all music. The simpler the ratio, the more 'pleasant' it will sound when played together, eg. 1-2 is the octave, 2-3 is the fifth. As you can cut the string any number of times, the number of these ratios (the number of notes in a scale) is unlimited, but western music settled on 12 because that number has some nice properties.
*Note - 12 tone equal temperament, that allows for the kind of transformations in the article does not exactly match these fundamental ratios. If we were using pure ratios, the distance between any 2 notes in the scale would differ slightly. Meaning you would have to retune a piano if you wanted to play in a different scale.
Also no country defines sovereignty through voluntary consent. Laws applies to you whether you agree or not.