If You want to switch to the next layer, hold the Up arrow until the end of the loop to go to the next layer. At layer 4, if you want to go back to layer 1, press the space bar. Hope this helps you if you don't know the controls. :)
Credits to fearless. for making the song. Also, If it seems that any of my projects either don't look how they are supposed to or look lazy, Its either because one of my friends got into my account (cough cough Totallyme), or I just didn't really feel like making something look good.