ruby-vorbistagger
ruby-vorbistagger allows you to handle comments (aka tags) in Ogg Vorbis files.
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The latest release is: 0.0.1
There's online documentation of the API and here's a little snippet to get you going:
require "ogg/vorbis/tagger"
# open the file
Ogg::Vorbis::Tagger.open("some_file.ogg") do |t|
# set a comment field
t.comments["genre"] = "Death Metal"
# write the comments back to the file
t.write
end