This is a very famous French tune, and is excellent for beginners to learn.
We are using it here to illustrate Basic Transposition in the Music Theory Section. Transposition is where we change a tune from one key to another (usually to keep singers happy). Go there to learn more about what is happening here!
Here we Have transposed the tune from C Major to the Key of B Major:
B Major Scale: B - C# - D# - E - F# - G# - A# - B
Notice that the melody is the exact same, except higher. Each note is exactly 1 frets lower than it was when playing in C major. This works because each major scale is constructed exactly the same way:
With intervals of Root - 2 - 2 - 1 - 2 - 2 - 2 - 1 (Octave)
The difference is the starting note, which in this case is B. Due to naming conventions, the B major scale is considered as a 'Sharp' Key because it contains 5 sharp notes - C#, D#, F#, G#, A#.
Don't fear the awkward note names, if you remember that the scales are really the same underneath, the rest is more a case of learning the names of the notes as you practice.
As Before, the B Major chord is strummed at the start to help give a context for the melody that follows.