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I am trying to write a program in JAVA that can open a song from a file (this i can do) and detect beats in a song. When it detects a beat it should say that a beat hasbeen detected and also count the number of beats in the song. My concern is how to start this type of code. What is the logic of the program in stages. Speedy advice would be very much appreciated. It may also be useful to code in Matlab. 
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I am trying to write a program in JAVA that can open a song from a file (this i can do) and detect beats in a song. When it detects a beat it should say that a beat hasbeen detected and also count the number of beats in the song. My concern is how to start this type of code. What is the logic of the program in stages. Speedy advice would be very much appreciated. It may also be useful to code in Matlab. 

Advice on implementation 2

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.