Xscape (album)
Track listing
Track listing
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* + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + - 
			* 
* + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + - 
																																
																																
																																	* + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + - * + Notes
																																
																																	*  signifies a co\-producer
																																	*  signifies a vocal producer

What does a * + - * + - * + - sequence signify in music?