That's awesome!
One of the best ways I have found to recruit musicians to Steemit is to show them the trending page for the openmic tag.This usually gets their attention and is easy for them to understand.
If they are still reluctant, ask them to allow you to record them playing a song on your cell phone and permission to post it on your Steemit blog. Then show them the earning a week later.
Make them a deal. If they join and start posting you'll transfer the SBD from the original post to their new account. If they don't join then you keep it. This usually works pretty well.
That's awesome! You've clearly done this a few times. Luckily, our excitement was contagious. He's coming back on Monday with three more people that want to join!