Today we started backing chords, so open your papers to 2014 backing chords question. This is number 8 C.
First of all, draw a chord box in the key given i.e. D major in this example.
From this, circle and note out all the passing notes. This is an unessential note that is not in the triad. For example, on bar one, the note 2 (quaver), and E the second note in the four quavers are both passing notes.
Remember upper and lower auxiliary notes or in step movement the third note generally.
Then after this, you name all notes on the page that are considered good to use!
Following on from this, you pick chords from your chord box that may fit the notes below on the melody line. For instance, in bar two, there is only two notes F# and B. The only chord that has an F# and B is vi, so this is the chord we put in the box.
When you come to a box that has a few options to choose from, i.e. box four which has only a D in it, your options are I, IV or vi. You then decide which chord you choose by looking at the next chord and seeing which move nicely together (look in your notes copy for this).
I hope this helps you.