A tremolo in music is another way of abbreviating notes, just like the arpeggio. Tremolos are horizontal slashes put on stems, which split notes in half. This is Part 24 of the How To Read Music series.
One tremolo slash will split a quarter note into 2 eighth notes, a half note into 2 quarter notes, and so on. Two tremolo slashes will split the note again, turning a quarter note into 4 16th notes.
If we use a 3rd tremolo slash, it splits the note so many times that we actually do away with note splitting entirely and we just play repeated notes as fast as possible, regardless of the original rhythm of the note.
Tremolos on whole notes, which don’t have stems, would just hover over them.
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