Ear training/listening exercises
How important is listening?
If you think it is important then here are some material to work with.
For some people these exercises will be very easy and for some not so easy.
The important thing is that you work on something that you enjoy and believe
is good for your musical growth.
There are a lot of resources on the web.
I recommend texts and software (Functional Ear Training) at Alain Benbassat's
home page.