Playing above and below the staff

The notes outside the staff join in: C4 and D4 below, G5 above. They are the ones you already read in unit 5, but now you have to produce them, and that is where it shows whether you really know which octave they are in.

If a ledger-line note keeps coming out an octave off, go back to the nearest landmark and count from it: C4 sits just below the staff, C5 in the third space.