What is a music sentence?

Answer 1

Musical Period

Answer 2

It's longer than a phrase, and has a sense of closure--the same way a period creates a sense of closure in a linguistic sentence. But it's not set in stone. You can call anything you want a sentence. But you better have some good reasons for calling it a sentence, or else a lot of people will disagree with you!

Answer 3

There are a number of different names available to us. A 'phrase' may be the most universal. A 'motif' for Classical Music. A 'riff' for jazz or blues. 'Melody' or 'Measure' may also be used.

Answer 4

Musical period.