By eHow Arts & Entertainment Editor
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A quarter note, also called a crotchet, is the most basic of music notes. It is written with a solid oval note head and straight line note stem. The duration of a quarter note is relied upon for counting the larger half and whole notes. Learning how to play quarter notes on a keyboard is essential for being able to play smaller and larger notes. In other words, the quarter note beat sets the standard for the other notes.