Le Grand Bleu

If you can handle this song's runs comfortably, you can try 21. But if it feels even slightly overwhelming, you should stick to 19 or 20. It's a classic run-heavy chart. Practicing it a lot will help you a lot.

despite having a 25-second stream similar to that seen in fallen angel d20, this one's a lot easier to hit + gives you much more time to catch your breath beforehand, making it a good bit easier (tho not super ez for a 20)

To me, it felt exactly like a spread-out version of La Grang Bleu S18. I think it's a chart that's definitely doable if you've mastered the basics of runs.

Except for Destiny Short, which I still haven't cleared, this seems to be the hardest in D20.