Light metronome. Metronome, Tuners Use the Metronome for keeping in time and learning rhythm. Numbers along the outer rim relate to the BPM (Beats Per Minute). Metronome free download by Music online flash: Light metronome. Metronome use for guitar training, guitar instruction- metronome Avoiding the use of the metronome, however, leaves you to sound like an amateur for the rest of your musical career, annoying your listeners and anyone.