Vocal music
Vocal music of the classical tradition has included a variety of ornaments known as trills since the time of Giulio Caccini. In the preface to his Le nuove musiche, he describes both the "shake" (what is commonly known today as the trill) and the "trill" (now often called a Baroque or Monteverdi trill). However, by the time of the Italian bel canto composers such as Rossini, Donizetti and Bellini, the rapid alternation between two notes that Caccini describes as a shake was known as a trill and was preferred.