First of all, we may encourage our students to listen more by motivating their interests in some subjects such as music, art, computer games and so on.
I sometimes ask my students to listen to English only for pleasure. For example, if he/she is keen on musical plays, I would like to ask him/her to listen to them no matter how they can understand the lyrics or not. If they enjoy the operas or musical plays, they will try to learn and understand what the lyrics are someday.
Generally speaking, I show my students from time to time how to access videos online in English so that they can know more information about the inter* resources that they may need.
Besides watching some sport in English or listening to music, I often recommend my students to watch English TV series or documentary films. I advise that they should imitate the speakers' pronunciation and intonation while they are watching all kinds of films which can not only help them improve their ability of listening but also definitely improve their speaking to some certain.