IS A METRONOME.
I have downloaded one onto each of my electronic devices, and a very cute one in the shape of an owl that Joe has had since he started piano lessons rests on my piano.
I used to think that metronomes held me back, and they made me feel contained. Now I am starting to think that I can hardly do anything without one.
It makes learning music so much quicker and it gets in your head and stays there. Also, the one on my i-pad is especially loud and can be heard over even the loudest screaming.
Okay, just had to decry the loveliness of metronomes. I will go away now.