Epidemic Sound - Website with licensed music to use in youtube videos
Bandlab - Capture, nurture, and collaborate on song ideas in the cloud
Zapsplat - Zapsplat Royalty free music is a website that covers an extensive list of royalty-free music, making you download over 85000 sounds effects in a very format like Mp3, FLAC, M4A, WAV, ACC, and many others.
Krue - Twitch for music: live streams from amazing musicians
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.
Soundscape - Sync your music with the open source community