set library to current application’s ITLibrary’s libraryWithAPIVersion:"1.0" |error|:(missing value)
if library is equal to missing value then return

set playLists to library’s allPlaylists()
set gArray to library’s allMediaItems()’s genre
set aRes to countItemsByItsAppearance(gArray) of me
–> {{theName:"サウンドトラック", numberOfTimes:1722}, {theName:"ロック", numberOfTimes:956}, {theName:"Podcast", numberOfTimes:721}, {theName:"クラシック", numberOfTimes:540}, {theName:"ポップ", numberOfTimes:529}, {theName:"J-Pop", numberOfTimes:382}, {theName:"アニメ", numberOfTimes:332}, {theName:missing value, numberOfTimes:287}, {theName:"Pop", numberOfTimes:279}, {theName:"社会／文化", numberOfTimes:279}, {theName:"World", numberOfTimes:218}, {theName:"ジャズ", numberOfTimes:188}, {theName:"Soundtrack", numberOfTimes:188}, {theName:"エレクトロニック", numberOfTimes:170}, {theName:"Classical", numberOfTimes:166}, {theName:"iTunes U", numberOfTimes:155}, {theName:"Rock", numberOfTimes:148}, {theName:"R&B", numberOfTimes:125}, {theName:"ニューエイジ", numberOfTimes:104}, {theName:"Unclassifiable", numberOfTimes:81}, {theName:"歌謡曲", numberOfTimes:58}, {theName:"オルタナティブ", numberOfTimes:58}, {theName:"Children’s", numberOfTimes:57}, {theName:"Holiday", numberOfTimes:38}, {theName:"Data", numberOfTimes:32}, {theName:"イージーリスニング", numberOfTimes:31}, {theName:"ワールド", numberOfTimes:30}, {theName:"ヴォーカル", numberOfTimes:29}, {theName:"ヒップホップ/ ラップ", numberOfTimes:24}, {theName:"Anime", numberOfTimes:23}, {theName:"フォーク", numberOfTimes:19}, {theName:"soundtrack", numberOfTimes:19}, {theName:"ブルース", numberOfTimes:15}, {theName:"ディズニー", numberOfTimes:15}, {theName:"シンガーソングライター", numberOfTimes:15}, {theName:"Easy Listening", numberOfTimes:14}, {theName:"ラテン", numberOfTimes:14}, {theName:"個人ジャーナル", numberOfTimes:14}, {theName:"Electronica/Dance", numberOfTimes:14}, {theName:"J-POP", numberOfTimes:9}, {theName:"New Age", numberOfTimes:9}, {theName:"アクション／アドベンチャー", numberOfTimes:9}, {theName:"ダンス", numberOfTimes:9}, {theName:"マンガ", numberOfTimes:7}, {theName:"演歌", numberOfTimes:7}, {theName:"プログラミング", numberOfTimes:7}, {theName:"Video", numberOfTimes:5}, {theName:"ホリデー", numberOfTimes:5}, {theName:"青年", numberOfTimes:5}, {theName:"キッズ／ファミリー", numberOfTimes:5}, {theName:"カントリー", numberOfTimes:4}, {theName:"R&B/ソウル", numberOfTimes:4}, {theName:"科学／医学", numberOfTimes:4}, {theName:"ビジネス", numberOfTimes:3}, {theName:"Latin", numberOfTimes:3}, {theName:"ヒップホップ／ラップ", numberOfTimes:3}, {theName:"チルドレン・ミュージック", numberOfTimes:3}, {theName:"#NIPPONSEI @ IRC.MIRCX.COM", numberOfTimes:2}, {theName:"コメディ", numberOfTimes:2}, {theName:"Technology", numberOfTimes:2}, {theName:"R&B／ソウル", numberOfTimes:2}, {theName:"ファンタジー", numberOfTimes:2}, {theName:"ユーティリティ", numberOfTimes:2}, {theName:"Vocal", numberOfTimes:2}, {theName:"ドラマ", numberOfTimes:2}, {theName:"社会科学", numberOfTimes:1}, {theName:"グラフィックノベル", numberOfTimes:1}, {theName:"コンピュータ／テクノロジー", numberOfTimes:1}, {theName:"伝記／自叙伝", numberOfTimes:1}, {theName:"女性", numberOfTimes:1}, {theName:"科学／自然", numberOfTimes:1}, {theName:"その他", numberOfTimes:1}, {theName:"児童書フィクション", numberOfTimes:1}, {theName:"業界／職業", numberOfTimes:1}, {theName:"レゲエ", numberOfTimes:1}, {theName:"Lifestyle & Home", numberOfTimes:1}, {theName:"マネジメント／リーダーシップ", numberOfTimes:1}, {theName:"スポークンワード", numberOfTimes:1}, {theName:"Dance", numberOfTimes:1}, {theName:"インストゥルメンタル", numberOfTimes:1}, {theName:"ライトノベル", numberOfTimes:1}, {theName:"SF／ファンタジー", numberOfTimes:1}, {theName:"ソーシャルネットワーキング", numberOfTimes:1}, {theName:"コンピュータ", numberOfTimes:1}, {theName:"146", numberOfTimes:1}, {theName:"健康／フィットネス", numberOfTimes:1}, {theName:"148", numberOfTimes:1}, {theName:"Electronic", numberOfTimes:1}, {theName:"仕事効率化", numberOfTimes:1}, {theName:"ライフスタイル", numberOfTimes:1}, {theName:"フィクション／文学", numberOfTimes:1}, {theName:"NHK FM(東京)", numberOfTimes:1}, {theName:"Seattle Pacific University – Latin", numberOfTimes:1}, {theName:"インスピレーショナル", numberOfTimes:1}, {theName:"日本／アジア", numberOfTimes:1}, {theName:"ブック", numberOfTimes:1}, {theName:"Kayokyoku", numberOfTimes:1}, {theName:"Folk", numberOfTimes:1}, {theName:"Romance", numberOfTimes:1}}

–出現回数で集計
on countItemsByItsAppearance(aList)
　　set aSet to current application’s NSCountedSet’s alloc()’s initWithArray:aList
　　set bArray to current application’s NSMutableArray’s array()
　　set theEnumerator to aSet’s objectEnumerator()
　　
　　repeat
　　　　set aValue to theEnumerator’s nextObject()
　　　　if aValue is missing value then exit repeat
　　　　bArray’s addObject:(current application’s NSDictionary’s dictionaryWithObjects:{aValue, (aSet’s countForObject:aValue)} forKeys:{"theName", "numberOfTimes"})
　　end repeat
　　
　　–出現回数（numberOfTimes）で降順ソート
　　set theDesc to current application’s NSSortDescriptor’s sortDescriptorWithKey:"numberOfTimes" ascending:false
　　bArray’s sortUsingDescriptors:{theDesc}
　　
　　return bArray as list
end countItemsByItsAppearance