This is a great tool to review the notes of the Bass Clef. Notes range from bottom line G up to top line A. This works great if you have access to a projector. You can call on individual students or let the class call out the letters. There are 20 questions, but I like to use the left arrow key to "back up" if students miss a note. (I will often go back and forth between two different slides, then finally move ahead to "tease" the kids sometimes.) Needless to say, we have a lot of fun with this type of review! Enjoy, and thanks for shopping!