Some include tremor resistance, environmental damage negation, and even stun/paralysis negation. For this note, it's all about the specific song list. Its echo song is Speed Up/Evade Window Up, which increases HH's Self-Improvement speed to about as fast as a sprint, and increases dodging i-frames, equivalent to 2 levels of Evade Window. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.