He used the vocal microphone to test the sound system from different locations around the arena.
The cardioid family of microphones are commonly used as vocal or speech microphones, since they are good at rejecting sounds from other directions.
His propensity for making his bandmates laugh around the vocal microphone whilst recording led them to banish him from the studio when vocals were being recorded.
Jermaine's vocal microphone was off and his bass amplifier was inaudible, so the show had to be stopped for several minutes while the sound crew fixed everything.
Home recordists still venture out when they need improved equipment and acoustics: a $10,000 vocal microphone, a specialized guitar setup.
This turns out to be a false ending however, as Wonder appears back onstage for an encore, returning to his harmonica, bongos, and the vocal microphone.
During live concerts, there is typically only one vocal microphone, used by Randolph to address the audience with encouragement and occasional exclamations of spiritual praise between songs.
D330 - a high-end dynamic vocal microphone used by ABBA.
C535 - a high-quality condenser vocal microphone.
The band doesn't even use vocal microphones on stage.