Is there any copyright issue in GIG's bg music?

[szsifat]

Hi there, as I am a video content creator I am planning to start a journey in Fiverr soon.
I have a question about GIG related which is, can I use music or background sound only in my gig video?
Without any voice over I just want to make an intro type video where I will showcase all of my video editing capabilities. But I am confused that if I use any sound from Youtube audio library or Facebook library or even Soundcloud, will it hamper or unacceptable for gig?
I hope I explained what I wanted to know.
Thanks in advance.