A sequencer in terms of music production is a device or application that allows musicians to record, edit, and play back music 'sequences', which are essentially a series of notes specified by pitch and duration that make up a melody or tune.

Sequencers are used to arrange these sequences into patterns, which can then be strung together to form a complete song. They're particularly essential in electronic music, where they're often used to control synthesizers and other electronic instruments.

Sequencers come in various forms:

Hardware Sequencers: These are physical devices that musicians can interact with directly. They were especially popular before the advent of computer-based music production.

Software Sequencers: Also known as Digital Audio Workstations (DAWs), these are programs that run on a computer and provide more advanced features like audio recording, effects processing, and mixing.

Step Sequencers: These allow you to create sequences by activating steps in a grid. They are often used in drum programming and for creating simple melodic lines.

Online Sequencers: These are websites or online applications like Online Sequencer, which provide a platform for creating sequences directly in a web browser. They are often more accessible for beginners and do not require the installation of any software.

In all cases, the goal of a sequencer is to help musicians create and arrange music, with a focus on the precise timing of notes and events.
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