What is the difference between Tremolo and Trill?

Tremolo in music sounds like quivering, while trill can sound like fluttering. A trill is usually written as a note to note above it in the key you are playing. Tremolos are popular in romantic music, while trills are more baroque. A trill is a swift alternation between two adjacent notes with a gap of more than a step between, such as third or fourth.

A trill is usually from the written note above it in the key you are playing. It’s either a half a step or whole step depending on the key, and if it’s specifically annotated, usually a minor third or more and the two notes for the tremolo are specified.