Epidemic Sound - Website with licensed music to use in youtube videos
SoundsCrate - SoundsCrate is one of the reliable websites that is designed to provide thousands of sound effects and royalty-free music, making you edit or create your own album.
Mixkit Free Sound Effects - Mixkit Free Sound Effects is a website that is introduced for incredible free sound effects, making you use in your cinematic projects without any hurdle.
Sample Focus - The easiest way to find the perfect audio sample
Freesound - The Freesound Project is a collaborative database of Creative Commons licensed sounds.
UseMySound - Free music for videos, ads, games & podcasts. Every week.