Convert your demo recording to a high-quality MP3, using an encoding program such as dBpoweramp, MediaCoder or Exact Audio Copy. Set the encoding bit rate to a 320 kbps constant bit rate. This setting provides high-quality audio, and is the most compatible with MP3 and MP3-CD players. Add ID3 tags to the MP3. If the listener transfers the MP3 to a portable media device, embedding ID3 tags ensures that she'll be able to locate your track on the player.
Prepare PDF versions of the textual elements of your music press kit. Using PDFs gives your press kit a professional look, and the format can be opened on any operating system. Create your PDF using a program such as PDFCreator or CutePDF; if you've written your cover letter and bio in Microsoft Word, export the documents directly to PDF. Keep both the bio and cover letter short; neither should be more than a page. If your recordings or concerts have received favorable reviews in the press, combine these review clippings into a PDF and include it in your press kit.
Take a black-and-white band photo using a high-quality digital camera. If you already have an analog band photo, scan it using a high-quality scanner. Resize the photo to 8 inches by 10 inches, which is the industry-standard size for promotional photos. Save your band photo as a JPEG file, and attach it to your electronic music press kit.