Who does the copyright of a song that I edited belongs to?
If you download a song from SOUNDRAW and edit it (for example by adding vocals or other instruments), the copyright of the original parts you added belongs to you, but the copyright of the whole song belongs to SOUNDRAW. Note that you can still monetize your content without any problem even if you don't own the copyright, and we will never ask you to share your revenues with us or bother you with any copyright issues. We keep the copyright of the music with the only goal of protecting you from malicious users who could try to sue you or claim revenue from your content.
Related to
How does copyrighting a song works if I'm subscribed to the Artist Plan?
Can I use SOUNDRAW's songs as my video's background music if I'm subscribed to the Artist Plan?
What is the difference between the Creator Plan and the Artist Plan?