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# Video Review: Music Library CLI
[Permalink](https://github.com/learn-co-curriculum/oo-ruby-video-review-music-library-cli/blob/ceacf6330fe289a02bb4421f07ba79b85c4993a1/README.md)
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## Video Review: Music Library CLI
### Overview
This video lesson uses a review of the Music Libray CLI lab as the basis for a comprehensive look at Object Oriented Ruby. Please do the lab before watching this video to get the most out of it.
### Objectives
* Create classes and add class methods for persisting and tracking instances
* Define find\_by\_name class method to find instance with a specific name
* Abstract methods to a module to avoid repetitive code
* Separate class and instance methods into separate namespaced modules
* Use getter methods to expose class variables
* Use `extended` hook to extend class variables from modules
* Define a module with the `create_by_name` method to create a new instance of a class
* Add setter methods to associate objects to each other
* Define and map out our associations
* Explain builder mixin and module patterns
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View [Video Review: Music Library CLI](https://learn.co/lessons/oo-ruby-video-review-music-library-cli) on Learn.co and start learning to code for free.
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