[defrost]

> it's very specifically used as "this belongs to that other group, nobody else can have it". And thus precludes any learning.

Nonsense. Whoever told you that was projecting.

Nothing precludes respectful collaboration and learning, eg: https://www.youtube.com/watch?v=xHgdrzgtBik and numerous other examples.

Worthy of note here is the Rolling Stones learnt about US "black music" from UK record stores, many run by former post WWII US servicemen who preferred the UK to the US South and Jamacian and Trinidadian musicians from the former British slave colonies.

They attended "black" clubs and jammed with black musicians .. they had an experience uncommon in US.