Learned about dir2ogg over here and am using it to convert MP3 to OGG.

So… I installed dir2ogg:

# apt-get install dir2ogg

And then I ran it on some MP3s, and the generated OGG files sounded like chipmunks. I read the man page for dir2ogg and saw that it had an option for mp3-decoder. I tried specifying the lame decoder but it complained that it couldn’t find it, so:

# apt-get install lame

Then I ran dir2ogg with the following command and the ouput OGG files sounded proper!

$ dir2ogg --mp3-decoder=lame --quality=10 .

Happy days!