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How are these three symbols different? i don't know even their name. I can play tr but i'm confused the first two.
pls give me explanations and examples.
The first is called a "turn" or more properly a gruppetto
. The second is a trill. How to play these is way beyond the scope of a simple post and is dependent upon the literature, the composer, and yes the performer. It should be well thought out and supported. You need to begin by examining the table of ornaments found in the Klavierbüchlein für Wilhelm Friedemann Bach
written by J.S. Bach. It may be seen at: http://en.wikipedia.org/wiki/Ornament_(music)