This is a Beat Box Gadget, Music Companion, Set Sequence of Sounds, Set Tempo and Play a Rhythm.
Operate the Tiny Switches to Turn a Drum on-off, The Sliders can be drag-dropped to set the interval. Press Play. LED corresponding to a drum will flash and a sound heard. More switches turned on means more drums and more flashing of LEDs. It will be an Orchestra.
You will need to get flash player if the music does not play. When Metronome page has loaded, then you will hear a small beat, that means the gadget is loaded. Or Else reload, refresh or visit gadget page again.
A metronome is any device that produces a regulated audible and/or visual pulse, usually used to establish a steady beat, or tempo, measured in beats-per-minute (BPM) for the performance of musical compositions. It is an invaluable practice tool for musicians that goes back hundreds of years. Metronome Live GitHub
Visit link above and see the html source of that page. The iframe code can be copied and integrated in your site/blog.