I think coaching is a great way to build student success in a smaller ensemble. Unfortunately, if there is a class of 100 students, a teacher might find it a little difficult to involve coaching in the classroom. Fortunately, as music teachers, we have the capabilities to that when it comes to composition. A student-centered approach will help the teacher engage with students directly without giving the students the “preconceived notion”. Students being allowed to do their work on their own time while the teacher walks around the classroom and answers the students’ questions is a great way to have the students build on personal creativity. The negatives would be that allowing students without much problem has the potential to cause more bad than good. Students given the opportunity to create with absolutely no idea of what it is to sound like before hand may have a negative effect on a student because they may not feel confident or they are just a person who absolutely needs something to grasp on to before they hit the ground running.
Yes, composition is about creating from nothing, but some students just don’t carry that attitude. A way to justify this is to create something for specific students who want it. If they want it, you can put a recording on your phone and let the student listen to it on headphones from your phone. That way no one else can hear it and they aren’t using their own phone or having to leave the application the assignment is on.
The technology I would use to teach the tune Frere Jacques is a recording sample of a theme and variation and what it is meant to sound like. I would use music writing software such as Musescore, and (to rob Keith’s idea) I would like to use a smartboard so they can “touch” the notes and move them around so they can have a literal “hands-on” approach when it comes to music composition.