created new track_search binding to allow searching for tracks (really recordings). Modified existing model classes to call super() to handle search (open/closed principle, attempting to reduce duplicate code). Fixed xml namespace issue in specs.

lib/musicbrainz.rb

@@ -29,6 +29,7 @@ require "musicbrainz/bindings/release_group_releases"
 require "musicbrainz/bindings/release"
 require "musicbrainz/bindings/release_tracks"
 require "musicbrainz/bindings/track"
+require "musicbrainz/bindings/track_search"
 
 module MusicBrainz
   GH_PAGE_URL = "http://git.io/brainz"

lib/musicbrainz/bindings/track_search.rb

@@ -0,0 +1,21 @@
+# encoding: UTF-8
+module MusicBrainz
+  module Bindings
+    module TrackSearch
+      def parse(xml)
+        xml.xpath('./recording-list/recording').map do |xml|
+          {
+            id: (xml.attribute('id').value rescue nil),
+            mbid: (xml.attribute('id').value rescue nil), # Old shit
+            title: (xml.xpath('./title').text.gsub(/[`’]/, "'") rescue nil),
+            artist: (xml.xpath('./artist-credit/name-credit/artist/name').text rescue nil),
+						releases: (xml.xpath('./release-list/release/title').map{ |xml| xml.text } rescue []),
+						score: (xml.attribute('score').value.to_i rescue nil)
+          } rescue nil
+        end.delete_if{ |item| item.nil? }
+      end
+
+      extend self
+    end
+  end
+end

lib/musicbrainz/models/artist.rb

@@ -25,11 +25,7 @@ module MusicBrainz
       end
 
       def search(name)
-        name = CGI.escape(name).gsub(/\!/, '\!')
-
-        client.load(:artist, { query: "artist:#{name}", limit: 10 }, {
-          binding: :artist_search
-        })
+				super({artist: name})
       end
 
       def discography(mbid)

lib/musicbrainz/models/base_model.rb

@@ -23,6 +23,38 @@ module MusicBrainz
       def client
         MusicBrainz.client
       end
+
+			def search(hash)
+				hash = escape_strings(hash)
+				query_val = build_query(hash)
+				underscore_name = self.name[13..-1].underscore
+				client.load(underscore_name.to_sym, { query: query_val, limit: 10 }, { binding: underscore_name.insert(-1,"_search").to_sym })
+			end
+
+			class ::String
+				def underscore
+					self.gsub(/::/, '/').
+					gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
+					gsub(/([a-z\d])([A-Z])/,'\1_\2').
+					tr("-", "_").
+					downcase
+				end
+			end
+
+			def build_query(hash)
+				return ["#{hash.first[0].to_s}:\"#{hash.first[1]}\""] if hash.size ==1
+				arr ||= []
+				hash.each { |k, v| arr << "#{k.to_s}:\"#{hash[k]}\"" }
+				arr.join(' AND ')
+			end
+
+			def escape_strings(hash)
+				hash.each { |k, v| hash[k] = CGI.escape(v).gsub(/\!/, '\!') }
+				hash
+			end
+
+			# these probably should be private... but I'm not sure how to get it to work in a module...
+			# private_class_method :build_query, :escape_strings
     end
 
     module InstanceMethods

lib/musicbrainz/models/release_group.rb

@@ -25,20 +25,16 @@ module MusicBrainz
         })
       end
       
-      def search(artist_name, title, options = {})
-        artist_name = CGI.escape(artist_name).gsub(/\!/, '\!')
-        title = CGI.escape(title).gsub(/\!/, '\!')
-        query = ["artist:\"#{artist_name}\"", "releasegroup:\"#{title}\""]
-        query << "type: #{options[:type]}" if options[:type]
-
-        client.load(
-          :release_group, { query: query.join(' AND '), limit: 10 }, 
-          { binding: :release_group_search }
-        )
+      def search(artist_name, title, type = nil)
+				if type
+					super({artist: artist_name, releasegroup: title, type: type})
+				else
+					super({artist: artist_name, releasegroup: title})
+				end
       end
       
-      def find_by_artist_and_title(artist_name, title, options = {})
-        matches = search(artist_name, title, options)
+      def find_by_artist_and_title(artist_name, title, type = nil )
+        matches = search(artist_name, title, type)
         matches.empty? ? nil : find(matches.first[:id])
       end
     end

lib/musicbrainz/models/track.rb

@@ -12,6 +12,10 @@ module MusicBrainz
           create_model: :track
         })
       end
+
+			def search(artist_name, track_name)
+				super({artist: artist_name, recording: track_name})
+			end
     end
   end
 end