My editor can't handle watching in real time, but I too repeat the song on the timeline and then render a draft, to make notes on what worked well the first go-around! It's really fun for me to see a rough draft get refined through this process.

It's also useful for me, because I can't watch in real time, to keep a few drafts around in the process, in case I make a change to the edit that doesn't work well. I usually number them to keep them organized.