Hello Dolly, one of WordPress's default plugins, serves as a teaching tool, showing random lyrics in the dashboard and reflecting WordPress's musical releases naming tradition.
Matt Mullenweg, WordPress co-founder, highlighted that Hello Dolly was inspired by 'Hello World' and the paradigm of actions and hooks within programming.
As a part of every new WordPress install, Hello Dolly continues for its teaching purposes and the shift to action-based application extending.
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