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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":" 使用 Haskell 创作音乐","articleBody":"1. Mezzo\r\n\r\n*Mezzo* 是一个可以描述音乐的领域内编程语言 / Haskell 库，它可以对不同的音乐创作模式进行静态检查（类似于静态类型检查，这当然也是得益于 Haskell 的类型检查系统），也就是说，如果你创作了“坏”的音乐，你的作曲将不会被编译 – think of it as a **very** strict spell-checker for music.\r\n\r\n   ```haskell\r\n   import Mezzo\r\n   \r\n   comp = defScore $ start $ melody :| c :| d :| e :| f :\u003e\u003e g\r\n   \r\n   main :: IO ()\r\n   main = renderScore \"comp.mid\" \"First composition\" comp\r\n   ```\r\n\r\n   Save, build and execute. You should get a `.mid` file in the project directory which looks something like this:\r\n\r\n![image](https://user-images.githubusercontent.com/44319278/118585673-fb762480-b7cb-11eb-85fd-efb93ed127c5.png)\r\n\r\n   To test the correctness checking, change the `d` note in `comp` to a `b`. You should see the following when you save the file:\r\n\r\n   ```\r\n   • Major sevenths are not permitted in melody: C and B\r\n   • In the first argument of ‘(:|)’, namely ‘melody :| c :| b’\r\n     In the first argument of ‘(:|)’, namely ‘melody :| c :| b :| e’\r\n     In the first argument of ‘(:\u003e\u003e)’, namely\r\n       ‘melody :| c :| b :| e :| f_’\r\n   ```\r\n\r\n   Mezzo has two ways of composing music: sequential (melodic) and parallel (harmonic) composition ...\r\n\r\n\t\r\n\t\r\n2. 一本很棒的书: http://euterpea.com/haskell-school-of-music/\r\n\r\n  - 使用 Haskell 编程语言探索计算机音乐和函数式编程的基础。\r\n\r\n     \r\n\r\n3. 其他的框架和库:\r\n\r\n   - [csound-expression](https://github.com/spell-music/csound-expression) - 专注于电子音乐的创作\r\n\r\n   - [th.composer](https://github.com/raptazure/th.composer) - 由 raptazure@λ-magic 创建\r\n\r\n    `th.composer` 的一个视频演示：https://github.com/raptazure/presentations/blob/master/haskell-music/music.mp4\r\n\r\n","author":{"url":"https://github.com/raptazure","@type":"Person","name":"raptazure"},"datePublished":"2021-05-18T03:24:00.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/4/lambda-forum.github.io/issues/4"}