If you both have BB/RB, simply save the MGU or the SEQ file from either and send it.

MGU is small and can attach to an email. SEQ files have audio so they will be much larger. Use a free large file transfer server such as DropBox and share a folder.

If you are working with folks who do not use PG products, simply go into BB or RB and export the individual tracks as waves and use Dropbox.

You can print and scan the chord chart or attach the file as an email attachment. Both work IIRC.

HOWEVER..... when I'm working on a song collab, one person in the project gets designated as the mixing engineer. That person gets the wave tracks. When I'm asking someone to play or sing a part, I send them an MP3 of the basic tracks so they can record their part. Using MP3 where possible saves time.

You can find my music at:
www.herbhartley.com
Add nothing that adds nothing to the music.
You can make excuses or you can make progress but not both.

The magic you are looking for is in the work you are avoiding.