Difference between a trill and a tremolo in music. if you reply without musical knowledge i will report! : )

A tremolo is a rapid alternation between two notes (or sets of notes, you can have polyphonic tremolos) which can be any arbitrary distance apart — including zero. A trill is a subset of tremolo, where the distance between any two notes being alternated is a second, either major or minor.

a tremolo is when you use your lower arm muscles to move a string instrument's bow very fast. in my orchestra music, the marking for tremolo is 3 short, 35 degree angle dashes that sit in between lines 2-4 on the treble clef. i'm not sure if the dashes can increase or decrease whether on how much the composer wants you to do tremolo.

a trill is usually have one finger down on a string and you move the next finger up and down quickly. this will create a series of 2 notes, the top being longer than the trill by a bit. trills are used to articulate notes to make them sound less plain.

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