Singer-songwriter is a term that refers to performers who write, compose, an sing their own material including lyrics and melodies, often providing the sole accompaniment to an entire composition or song. This form of artistic expression is very common among performers with less money than more well-known pop artists who can afford to hire backup musicians. Some of these artists depend on word of mouth and extensive touring to garner a fan base and commonly appear at house concerts, coffee houses, folk clubs, and festivals. A number of well-known performers may write some of their own songs but, despite being both a singer and a songwriter, their output is not sufficient for them to be known by the title of singer-songwriter, and are instead referred to as singers.