Z:gnu-www-ja-why-audio-format-matters--52ddda-The Ogg Vorbis home page, =3Ca h/en

The Ogg Vorbis home page, www.vorbis.com, has all the information you need to both listen to and produce Vorbis-encoded files. The safest thing, for you and your listeners, would be to offer Ogg Vorbis files exclusively. But since there are still some players that can only handle MP3, and you don't want to lose audience, a first step is to offer both Ogg Vorbis and MP3, while explaining to your downloaders (perhaps by linking to this article) exactly why you support Ogg Vorbis.