Scavenger Hunt, season IV

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Here’s a little unknown fact: I went to a music class last summer to become more attractive. Unfortunately for me, I spent so much time sleeping during the class, and the teacher was not very good though (I hate advertisement!), so I didn’t learn much. I tried to write this sheet music of Em Dạo Này, one of the songs by the band Ngọt, but when I gave it to my friend and he played it, everything sounds wrong. Well, technically it sounds like the original, only the note lengths are wrong. I almost threw it away, but then I found something hiding in this sheet music, so I uploaded it here for you.

Can you find the hidden message?

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