Music "waves" for a game, need help

Hi
I am gonna use turing (basic programming language) to build this rhythm game, at least I really want to, but the problem is, I want to read the "waves" of the selected song. By Wave I mean, you know when song starts to climax, the beats go higher, I mean those "music bars" or lines or w/e they're called. How can you read those waves out of the mp3 file and turn them into like music bars or something like that. Where do programmers get values for that. Is it complex? Thanks in advance.