how to enable internal audio recording?

Hi, i often see people on Instagram record their story with songs. their song sounds crystal clear as if it's played from my phone. but when i try to do that my recording sounds terrible, it's recorded from the microphone. i also used Du Screen Recorder but the result is the same. in the settings it says "Internal audio recording is not allowed by Android Now." is there any way to enable it or other ways to record songs with clear sounds?
My phone is Xiaomi Redmi 4 Prime with Android 6.0.1 (Marshmallow), MIUI 8

many thanks.

(sorry for my bad English)

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