Consideration must be given to teaching a variety of musical constructs through repertoire. Students should be exposed to a variety of keys, meters, harmonic, and articulation styles, as well as a variety of genres and forms. While liking a piece can be a powerful student motivator, it is not the only concern. Students like what they know. They can't like anything else unless they have been led down other paths.
Motivation is often the result of association, novelty, or degree of challenge.
Just as our diets are enriched by variety, a student's musical experience is enriched by exposure to a varied repertoire. Eating cotton candy once or twice a year is a good thing, but we wouldn't want to have a steady diet of it. Similarly, an excursion to a foreign cuisine is a welcome departure from our normal daily fare. Transparent scoring exposes players to error, but it allows for the development of musical independence. While homophonic scoring is much safer, it denies players the opportunity to develop musical independence.