Question

O, it came o're my ear like the sweet sound

Answer 1

The answer is a simile because it uses "like"
A personification is making an object or animal act and look like they are human. Example: She heard the last piece of cake calling her name. This is personification because cake doesn't talk like humans can.
An oxymoron is using two words to describe something that mean the opposite. It is kind of like irony.
Example: A fast turtle. This is an oxymoron because turtles are not fast.
A synecdoche is a part used to signify the whole. Example: Check out my new wheels. Wheels is a synecdoche because it is referring to a car.
A simile compares two things using like or as. Example: She is as innocent as an angel. This is a simile because it uses as to compare something.