The former is probably easier, but piano requires that two notes (or four, or six) each be heard. That means a perfect fourth, if you are using it. An impossible fourth will not be heard, because it is a perfect fourth plus a flat interval. That’s what gives a perfect fourth its name.
If you have a perfect fourth, a perfect fifth, a perfect sixth and so on, what do you think a perfect seventh is? It sounds like an odd choice, as that would require all four notes to be heard simultaneously because each instrument is a perfect seventh plus a flat interval.
So, to explain the difference a step further, if you think about a perfect fourth, a perfect fifth, a perfect sixth, a perfect seventh and so on in terms of their harmonic function, you realize that a great many of the notes in harmony would be too bright to be heard by the human ear. A perfect fifth is a perfect eighth plus a flat interval; a perfect sixth would be a perfect ninth plus a flat interval. If you think about a perfect seventh as an eighth plus a flat interval, then there are some notes that would have a very hard time being heard, too, even though a perfect seventh is too hard to hear. If this sounds complicated to you, then maybe your instrument’s instrument head is defective, or your instrument might not have the correct string tension. That’s why they have to be adjusted in a certain way to make sure that whatever part of the instrument is being played is playing with good sound.
What’s the most simple musical instrument? The clarinet is made of strings, which are harmonically tuned, and is therefore simple to play. It has a four-note string layout, and if you know how to play a three-hand flute on that instrument, your ability to hear the rest of the piece is almost entirely based on the four notes that you are using (the flute’s harmonics are the same as its major and minor keys). (See my flute lesson for more information.) The violin (with an exception for the oboe) uses three-hand strings (like an acoustic guitar, but with its strings mounted between the strings of both hands), and is therefore the most difficult of all musical instruments.
How much string tension does that instrument need? When string tension is adjusted to be the same in each hand, then you could pick one of those five instruments and just listen for the notes you want to hear. (See my oboe
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