In this song I went for changing the time signature, if you listen closely you'll hear the song start at 130bmp in 3/4 time signature but after a while, it changes to cut time in 100bmp.
You can use this song without permission just make sure to give credit.
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*You may not use this work without making specific arrangements with the artist UNLESS your work is a web-based game or animation, in which case you may use this freely.