As mentioned earlier, transposing means changing the key of a piece of music. This can apply to a scale, a phreas, a short melody, or an entire piece. The ability to transpose is an important skill for all musicians to develop. The easiest way to transpose is to write the scale degrees under the original melody and then work out which notes correspond to those scale degrees in the key you want to transpose to. Here is an example of a melody transposed from the key of F to key of C. Try this same technique with other melodies from earlier in the book, or any other tunes you know.
In lesson 12 you learnt the following song in the key of C major. Here is the same song transposed to the key of F major.
Here is a famous piece by Brahms in the key of F amjor. Once you have learnt it, try transposing it to C major.