Lavalier microphones are attached differently depending on the nature of their use. In theater applications where the microphone is used to amplify an actor or a singer's voice, lavs are typically concealed in the performer's hair; this placement eliminates the possibility of scratching against their clothing while they move, which would result in the amplification of the scratching sounds as well. It also adds to the suspension of disbelief, since the characters themselves would not be wearing microphones, especially if the plot is set in a time before lavalier microphones existed. Occasionally, specially designed skin-color headsets known as "headworn microphones" are used in stage applications when actors spend a good deal of their performance singing and moving around quickly, such as in stage musicals and in lecture or presentation scenarios. A headworn microphone is essentially a lavalier on a stiff wire mount that loops over the performer's ear.