I've written bios, long and short, for many different purposes, the most common of which is website copy. Bands often need bios, anyone trying to create an online portfolio needs a bio. If you have a new website up, you're a new band, you are trying to book gigs, or just just want to look more professional, I can help you by writing an appropriately sized description.
If it's for a CD or something short, like above, probably 50 to 100 words. For a band, 300 to 550. For a professional who wants it to take up a sizable amount of a web page, perhaps longer, 550 to 1000 words.
I'm creative, I love me some adjectives and adverbs, and I can take any information you give me (even if just in bullet points) and craft a tantalizing description sure to sell whatever it is you want to sell--your product, your music, or you.