It sounds like you're describing a type of musical notation, possibly related to bass guitar or keyboard music, where specific symbols and numbers indicate various playing techniques and dynamics. Here’s a breakdown of the elements you mentioned:
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How many notes to play at once: This could refer to chord symbols or tablature, where your specific note choices (single notes or chords) are indicated. For example, if you see a chord symbol above a staff like "Cmaj7," it denotes that you should play multiple notes that make up that chord simultaneously.
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How long each note should be held: This typically relates to the rhythmic values of notes, which may be indicated by their shapes (quarter notes, half notes, whole notes, etc.) or by specific numerical indications (like "1/4" for quarter-note lengths, "1/2" for half-notes). In bass guitar notation, some styles may also use a number system that indicates duration through rhythmic values.
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How softer or loud to play: Dynamics in music are indicated using terms like "piano" (soft), "forte" (loud), or symbols like "pp" (pianissimo) for very soft, and "ff" (fortissimo) for very loud. The use of crescendo (gradually getting louder) or decrescendo (gradually getting softer) symbols may also be included.
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With harmonies that should be played in the right hand: In keyboard music, the right hand often plays the melody and harmonies. Charts or notation might indicate what harmonies are to be played, possibly through chord symbols or specific notes written on the staff.
If you need specific guidance on any of these elements, feel free to ask!