Duets with Diabelli
Anton Diabelli was an Austrian composer and publisher, and a contemporary of Beethoven.
Through a Melbourne-based piano educator, Tim Topham, I've only recently been introduced to Diabelli's duets, some of which are very much suitable to beginner-level pianists. In my (and Tim's) opinion - they're great!!!!! I think they are an excellent way of introducing students to classical repertoire, where the finished product belies the degree of difficulty in the "primo" (in this case beginner student) part.
If only for fun, I'll be introducing some of the Diabelli duets with all of my beginner students.