Pixabay has royalty free music you can use for free
The devil is in the detail as they say.<p>Pixbay is verry waffly on what is and is not permitted[1], and in their "conclusion" they basically wash their hands of the risk, putting the onus back on the user:<p><i>Understand that Pixabay images can be used in many instances without asking permission from the image author. However, it is your responsibility, to make sure the depicted content (persons, logos, designs, property, etc.) is suitable for your use and does not infringe any rights.</i><p>Meanwhile, somewhere like Getty gives a clear warranty that using their Royalty-Free content will not infringe on rights[1]:<p><i>For licensed royalty-free content (excluding content marked “editorial” or “intended for editorial”), Getty Images warrants that your use of such content in accordance with this agreement and in the form delivered by Getty Images (that is, excluding any modifications, overlays or refocusing done by you) will not infringe on any trademark or other intellectual property right, and will not violate any right of privacy or right of publicity.</i><p>[1] <a href="https://pixabay.com/blog/posts/pixabay-license-what-is-allowed-and-what-is-not--4/" rel="nofollow">https://pixabay.com/blog/posts/pixabay-license-what-is-allow...</a>
[2] <a href="https://www.gettyimages.co.uk/eula" rel="nofollow">https://www.gettyimages.co.uk/eula</a>