How to list Content A nodes on Content B's page using Entity Reference fields and Views (with Paragraph field Bundles attached)
Simply under Advanced (far right), for Contextual Filter add your entity reference field. In my test, I called it "Made by" field_made_by.

Note: The view preview will be blank as the view edit page does not have an ID. Just place to your Musician page and it will show up then.






  However, when using paragraphs module to add node bundles is more
  complex because technically a paragraph bundle is it's own entity, so
  Content A references a Paragraph Bundle with an entity reference field
  within its bundle (LOL). It gets pretty complicating. Any help with
  that?


Then make a view of Paragraph and not of Content. 



Then add relationship of Paragraph referenced from field_paragraph (paragraph field)

Then in contextual filter add field_made_by (entity reference field).