listening advices?

it's time to break down another wall in my english skill, so:
question to all english user.

how to boost your listening skill?

i never had any toefl test but my toefl preparation test in high school told me that i'm "good" in listening (one level away from "excellent"). i don't have any problem listening to movies (which usually has good quality sound), but i have trouble to comprehend things like interviews(usually youtube videos), and songs. especially song lyrics.

so, any advice?