I have a track featuring a lyric from a previous Challenge, but which I revised several days ago, and which now has music composed this week by a FAWM/50-90 member. So I know it's OK to post that.
However, the vocalist and the bass player aren't members.
Do you folks think it's still in the spirit of the Challenge even if not all collaborators are members?
Thought I'd try to get a consensus before I post the song. 
Yes, certainly!
Yep - I’ve had assists from folks who aren’t FAWMers and they have no problem with me posting.
Good way to get them to join
I often post collabs that are not with members. I do ask them first though
Thanks so much, folks.
I'll go ahead then.
(No problem regarding the non-members. I was simply concerned that posting a song that included non-members might be considered against the spirit of the Challenge.
)
Crazy thing is that in my 12 years doing FAWM and 50-90, I'd never paid attention to whether members were assisted by non-members in their music. So I wasn't sure what the deal was in that regard. Now I know.