The piano is a great instrument because of how easy it is to pick up on it. Unlike other instruments like the violin, or the guitar, you always know what you are going to get when you attempt a note. It also sounds amazing to the ear and is very relaxing to the ear.
Those are scales. the highlighted notes (aka the guide tones) are notes in that specific chord that give a harmonic pull towards the next chord. generally they are the 3rd and 7th note (that’s what determines what type of chord it may be: major, minor, major-minor, or dominant). they are the most harmonically important notes in the chord since they determine the quality of the chord itself, so make sure they are in perfect tune.
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Well, to answer your questions different types of genres of music constantly lived and died throughout the years. Sometimes it could be a trend or something that's out of date. Music genres depend on different types of factors like mood or one's culture.
Explanation:
Here ya' go? A really bad doodle brought to you by me. Hope this helps? (Just trace it if you need to, I really don't care)