i'm talking about music
what are the different section of music on a concert program called
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I believe you are referring to "movements." It is customary not to applaud in between movements if you go to a classical music concert. You can think of it like an Opera that has several scenes (this is just a very simple analogy for you to understand).
If you are referring to a "section" withing one piece of music, then it is a different story (but in that case, it would just be called a "section!").
If the work in question is a symphony, concerto or serenade, the different sections are called movements. In the mid to latter 1900s, some composers (e.g., Liszt) abandoned the symphonic form and started writing large-scale works which are referred to as tone poems. An example is "Also sprach Zarathustra" by Richard Strauss. Another wonderful example is "Finlandia" by Jean Sibelius.
Some works are large enough that they don't need to share the program with any other works. A notable example would be the "Grand Messed des Morts" (Requiem) by Hector Berlioz which, all by itself, produces an evening's worth of glorious music. It is in ten sections (movements) which correspond to the ordinary of the Roman Catholic Requiem.
You've asked a confusing question. Please get back to me with more details about what you are referring to.