Regarding PG forums...their forums, their rules! But for other purposes don't let the idea of procuring a license put you off. Typically not a big deal nor a big expense! In the US you do not need permission to record a cover of a song that has been commercially released. But you do need a license and be set up to pay royalties on all sales.

Check these resources for more info...

http://www.songfile.com/

https://songclearance.com/