Has anyone had any experience with buying audio track licenses for facebook ad videos? [or any ad videos for that matter]
From what I find, there are different types of lcienses one can get, and it would be pretty stupid to get banned or sued for not getting a license.
Any tips / experience?

I've always used copyright-free options for this... Are you planning some big ads where you go with like GoT theme or is it for your regular 60s e-com product ads?
You should be able to find royalty free audio tracks even on YouTube. Simply throw them on adobe audition and extend the length to your needs.
If you want to go with paid audio, then Audio Jungle has some good collection.
I would say most people use "royalty free" music for this and I'm sure many ignore the rights completely too
But better to be safe than sorry, right?
There is a lot of providers of such music clips:
https://www.premiumbeat.com/
https://www.bensound.com/
https://www.hooksounds.com/
https://envato.com/elements/lp/royalty-free-music/
Here is a blogspot that lists some more: https://blog.hubspot.com/marketing/r...e-music-videos
Plenty of aspiring musicians are trying to build their audience by offering some clips for free, then selling premium beats. Such as this one: https://cfmfreemusic.com/
Happy browsing 