If your post contains audio, then you should use this post format. Select Audio in the appeared metabox and add link to your mp3 file.
Post simili
Gallery post format
This format can be used to display images as a gallery. To attach images to
Quote post format
Welcome to our wonderful world. We sincerely hope that each and every user entering our
Status post format
I am a status post format.
Link post format
I am a link post format.