As simple as that!pls see those searches:
http://www.google.com.eg/search?hl=en&newwindow=1&as_q=music...


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Note added at 1 hr (2008-10-13 20:46:04 GMT)
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http://en.wikipedia.org/wiki/Sentence_(music)
"Sentence (music)
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In music a sentence is "the smallest period in a musical composition that can give in any sense the impression of a complete statement." It "may be defined as a period containing two or more phrases, and most frequently ending with some form of perfect cadence." (Macpherson n.d.: 25)

Some theorists consider a sentence to be a musical form distinct from a period. It consists of a presentation phrase (a repeated motive) followed by a continuation phrase which ends in either a half cadence or an authentic cadence."

Also"PHRASE"
pls see the definition in :

http://www.classicalworks.com/html/glossary.html

"Phrase - A single line of music played or sung. A musical sentence".



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Note added at 1 hr (2008-10-13 20:46:40 GMT)
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So my suggestions: Musical Sentence/Phrase