Claim: Tori Kelly is a person.

Singing is the act of producing musical sounds with the voice and augments regular speech by the use of sustained tonality , rhythm , and a variety of vocal techniques . A person who sings is called a singer or vocalist . Singers perform music -LRB- arias , recitatives , songs , etc. -RRB- that can be sung with or without accompaniment by musical instruments . Singing is often done in an ensemble of musicians , such as a choir of singers or a band of instrumentalists . Singers may perform as soloists , or accompanied by anything from a single instrument -LRB- as in art song or some jazz styles -RRB- up to a symphony orchestra or big band . Different singing styles include art music such as opera and Chinese opera , religious music styles such as gospel , traditional music styles , world music , jazz , blues , and popular music styles such as pop and rock .   Singing can be formal or informal , arranged or improvised . It may be done as a form of religious devotion , as a hobby , as a source of pleasure , comfort , or ritual , as part of music education , or as a profession . Excellence in singing requires time , dedication , instruction , and regular practice . If practice is done on a regular basis then the sounds can become more clear and strong . Professional singers usually build their careers around one specific musical genre , such as classical or rock , although there are singers with crossover success -LRB- singing in more than one genre -RRB- . They typically take voice training provided by voice teachers or vocal coaches throughout their careers .