Pixabay have some (some thousands) videos
Free download if you register
Not the biggest selection
But generally good quality
Now there is some free music downloads
Again, some thousands
Useful if you need free video & audio
Have you noticed that when you put the <audio> HTML tag in autoplay mode on your landing page, it doesn't automatically play the sound on mobile? That's because mobile devices doesn't allow the autoplay mode.
However, there is a script that you could use for bypassing this...
Attention: "role based name" email prefixes such as support, webmaster, info, contact, forum, service, affiliate, admin, traffic, partners, marketing, etc., for our member accounts are not permitted. They are acceptable for a vendor listing, but not for the member email. This is due to bulk email processors scrubbing them for delivery due to extremely high bounce rates. Please apply for membership using a personalized email prefix. Something like firstname.lastname@example.org.
If we discover you signed up with a role based name we will give you only one message to change it. After 3 days your account will be removed if the email is not changed.