I want to do a full game vocals run, but I have 2 questions first:

1. Can I switch between solo and harmonies for different songs, or do I have to pick one and stick with it the whole time?

2. Sometimes the results screen will show 99% instead of 100 even when I get a Fab for every phrase. Does that still count as an FC for the purpose of the speedrun?

I'll admit I didn't take Harmonies into account when making the category, but for the sake of consistency, it would be for the best that you stick to one setting for the whole run without swapping mid-run. I'll go ahead and add a variable for denoting Solo/Harmonies; they can share the same leaderboard. (Though if the day comes where a three-person team attempts a Triple Harmony FGFC run, I'll amend the board further to accomodate that.)

As for the 99% glitch (which happens if you get at least one Fab rating that doesn't yield the full 1000 points), it would still be an FC since you achieved the maximum streak. I'll amend the rules to clarify that those cases are accepted.