txtDefinition=The rapid alternation between two adjacent {\uldb notes}{\v 89586}. In Mozart, trills are invariably used to intensify a {\uldb melodic}{\v 86956} line, especially at a {\uldb cadence}{\v 21968}. In the brief examples from the first {\uldb movement}{\v 151907} below, the {\uldb first violinist}{\v 126742} plays the same {\uldb passage}{\v 90954} with and without a trill.