#1
So is changing a key of a particular piece of music is simple as comparing the scale degrees? Tonic to tonic and etc.

Does this work all the time?
=D
#4
Are you talking about modulation or transposing? If you're transposing a piece, you work out the relationship between the keys (if you're transposing from C major to E major, then you're transposing a major third up) and then move everything up by a third (don't worry about major/minor thirds - the key signature will compensate for this). If there are any accidentals, then work out whether they flatten or sharpen the note in question in the original context, then apply the appropriate accidental in the transposed version. If you're talking about modulation, I don't understand the question.
#5
Hmmm I am trying to transpose this exercise in G Major scale into B Flat;

The original notes in G Major: G A B C D E F# G
B Flat: Bb C D Eb F G A Bb ?
=D
#6
Quote by Alakazam
Hmmm I am trying to transpose this exercise in G Major scale into B Flat;

The original notes in G Major: G A B C D E F# G
B Flat: Bb C D Eb F G A Bb ?


That is exactly right.