Open your Frontpage web;
Import the Mp3 file (File > Import).
Then in the page you want to have it, create a hyperlink to the file.
Save the page, and publish both that page and the Mp3 file.
When people click the link, it will download and then play - this might take
a while since the file could be pretty big considering it's 30 minutes.
The other alternative, is to "zip" the file into a compressed folder, link
to, and upload the zipped copy of the mp3 file. people can then download
the zip folder, and decompress the MP3 file, save it to their hard drive,
then open it in their media player.
To zip a file in Windows, you just right click the file, select "Send to"
and choose "compressed (zipped) folder"
Then import the *.zip file into your frontpage web, and create the link to
that file.
Then publish the *.zip file and the page that contains the link to it.