Note Invaders is an excellent way to learn the notes on the musical staff (the five lines on which music written). It's presented as a game: these lines are produced on the screen along with particular notes which must be learned before being zapped out by the menacing 'invaders'.

There are three levels of difficulty and either treble or bass clefs can be chosen. Keyboard operation is simplicity itself, in that keys A to G represent those notes displayed on the screen. As you get faster and more accurate, the staff itself gets shorter: so you really have to know your note names well to get a high score.

Four programs are included on this cassette, at least two of which I found particularly useful in my own attempts to learn musical notes. Note Invaders should appeal to all ages - in fact, anyone contemplating learning music or perhaps an instrument.