Introduce the artist by name and be sure to include what musical genre to which the artist most clearly belongs. Yes, every musical artist claims to transcend genre, but with the plethora of quite specific genres available, it should be rather easy to place any particular artist correctly. The introduction is also a good place to mention where the band came from or started performing.
Produce a reason for why this bio has been written by specifically mentioning anything that the artist is currently working on at the moment. This can be a new album, the launch of a concert tour, an appearance at a multiband concert event, or even just the announcement of a lineup change. To cement the importance of this biographical material, include any relevant material such as a link to a website or concert tour dates that have been finalized.
Provide background material for the band by reminding the reader of the bio of past accomplishments as well as up to date information on anything that members or the solo artist has been doing. This could include side projects, work on movie or TV soundtracks, acting gigs, or even charity events. This is also a great place to add the discography of the artist. It never hurt to remind readers of everything that the band has recorded and released and a discography is also an effective way to get those unfamiliar with the artist to check out those recordings.
Complete the bio succinctly and with pertinent information about what the artist is doing for the immediate future as well as any hints about potential projects or plans. Always give the reader of the bio a reason to look forward to what is not planned as well as what is already taking shape.
Avoid making the bio read like a resume. Inserting humor is not a bad thing in most cases. Overstating the case is and relying on cliches is not encouraged. Resist the urge to be lazy and use well-worn phrases that have been used to describe practically every artist of the century like "gifted" "talented" or "groundbreaking."