A music sequencer is a software or hardware tool that allows musicians to record, edit, and play back music. It enables users to arrange musical notes and sounds in a timeline, making it easier to create complex compositions. Many sequencers support various audio formats and can integrate with other music production tools. Sequencers often come with features like MIDI (Musical Instrument Digital Interface) support, which allows for the control of electronic instruments. Popular examples of music sequencers include Ableton Live, FL Studio, and Logic Pro. These tools are widely used in both professional studios and home music production setups.