There are a great number of subjects about which no one cares on Wikipedia. With new bands this is especially important to keep in mind, given that a relatively high proportion of new pages are about a "garage band" (so-called because of their tendency to only ever play in their parents' garage) or "Yet Another Myspace (or Facebook or YouTube) Band", "YAMB" for short.
Editors, especially new page patrollers, can learn to spot garage or Myspace/Facebook/YouTube band pages; and creators of said pages can learn why their page was speedily deleted (normally due to a lack of a credible indication of importance or being blatant advertising.) Usually, the band is unsigned, has released no albums (or only a self-produced CD), and the article about them was written by them.