I’m afraid that, although I’ve figured out what a basic idea is, I don’t quite know what a motive is. Is it a certain group of notes or something else?
Peter, a motive can be two notes, or a group of notes. It generally is characteristic, so it will have a unique rhythm or a unique interval or intervals. It may not feel complete within itself, as motives are usually joined together to create basic ideas (which are 2 measures in length and feel like complete musical thoughts).