The chap who talked about this package said that it wasn't hard to see the educational potential of creating karaoke files... so I asked my Twitter network:

- Health and Wellbeing (HWB)/ literacy/ Expressive Arts (EXA) rewrite a song as expressive activity relating to relevant topic e.g. HWB 2-08a, Literacy 2-02a, EXA 2-18a. Model lyrics example by creating a whole class song then set group tasks by using an existing song as a base pupils already have a grasp of the music. (Depending on class you may provide small selection.)
- ikaraoke in any other language surely - is it possible to switch languages?
Two great suggestions. Do you have any others you could add?