maybe this is a dumb question but I want to ask when you have in the music sheet for example the symbol of the chord C7 or whatever; to put a symbol instead notes means you can play random the keys in the piano as you want and that correspond to that chord in the time you want?
For example in notes in the music sheet is very clear, you follow each note according how it is in the music sheet and the time, of course very easy (half, whole, etc.). But sometimes I see in lead sheets the chord above the melody notes, how you know how to play the chord above the notes in the lead or music sheet? In other cases there are slashes and you don’t see any note, but when someone is playing magically that slashes or chord symbols, as I mentioned before, are converted in a beautiful song or instruments.
I ask this to know how you interpret the chord symbols or slashes and how you know the complexity of the full song included inside of them, maybe is a random and will depend on the artist?
For example look the picture the chords above the notes what mean, mean the notes in the melody of the melad sheet or another different melody and how is played, as I said before?