Sometimes people read some verses in Ester and other books in a different cantillation. For example, in Ester, some read the verse of "אשר הגלה מירושלים" to the tune of Eichah, and the Mishnah Brurah ...
I've seen people standing next to Torah readers and making hand signals during the Torah reading, presumably to prompt the reader in the trope. I think @Shalom mentioned this in Method for practicing ...
Who created the trop (cantillation) for leining? Is it a Mesorah from when the Torah was written?