New or unknown bands often find the format marketable for smaller venues, such as pubs, clubs or parks.
For example, the Rolling Stones released three albums consisting primarily of covers and then recorded one with their own original material.
When a band is starting out, they might play private parties and fundraisers, often for little or no money, or in return for food and bar privileges, although many professional musicians refuse to do this.
With enough experience, a band will begin to "play out" professionally at bars and night clubs.
Some cover bands will play a variety of song styles, from different artists, genres, and decades.