Flag of Germany: Flag of Germany, horizontally striped flag of black, red, and gold (golden yellow); when used for official purposes, it may incorporate a central eagle shield.
Most of the websites i have looked at, say that the frequency of middle C note is approximately 261.626 Hz. and that middle C on guitar is at the 5th string 3rd fret. but my tuner says the frequency at the 5th string 3rd fret is 130.81 Hz.
Play both to notice the difference. - As the key of C does not include any black notes, beginners start playing tunes in the key of C by placing both thumbs on middle C and placing each finger on each subsequent white note. Middle C is the C note in the middle of the piano usually above the keyhole in the wood. About the notes in a scale: The above may be a lot for your child to take in at once, but it will start making sense when he/she starts to play. Start your child off by learning the scale of C. Get your child to sit up straight.