A metronome is a useful device that generates a constant beat. It is very useful when learning to play songs, especially songs which involves good timing and rhythm. A metronome can come with a tuner, a chromatic tuner. A guitar metronome can also be used for other things, such as for drummers. Hence, band members are able to share a metronome. Looking for free metronome online? Check out onlinemetronome.com!