Removing unnecessary `new` keywords
Removing unnecessary `new` keywords

Since `Note` is a builder function that doesn't bind variables
to `this` there isn't a need to use the `new` keyword.

For `SequenceParser`, since it is already defined and `parse` is
treated like a static function, there's no need to re-initialize
it for each test.

jstrait/jssynth,jstrait/jssynth