Do you need a tremolo on a electirc guitar?

A tremolo is a quick repetition of a note (or 2 notes/chords in alternation). It produces a rumbling, thundering effect if used in the bass, and when used softly in the high registers, it can create an eerie atmosphere. Adjusting the volume of tremolos (suddenly loud/soft) can also emphasise and enhance its effect. Another use of a tremolo is the well-known drum roll used offen to signal or lead into an entrance.

A tremolo is capable of adding to the tension of a piece, or leading the music towards the climax. As such, it is not uncommonly to find tremolos at the end of a grand piece.