Rhythm details

[Alberto Simões]

hi

I am trying to find how to typeset the rhythm in attach, but given I do 
not know what is its name (neither in Portuguese, English or Italian or 
any other language) it is getting difficult to find how to do it.

Can anybody please let me know how this is called and, if you know, 
where in the documentation I can find how to typeset it?

Thank you
Alberto

rhythm.gif
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