-Specific parts of the song are repeated, making it even easier to memorize new vocabulary.

-It is scientifically proven that the brain is able to absorb information at a much faster rate when involved in an activity that you enjoy.

-You will not only learn new words but also how these words are used in sentences at the same time.

For more information visit: www.language-united.com/foreign-language-learning-tips.html

However, when I was learning Chinese I found that watching movies was also a great way to improve my language. Now, watching was not really enough, you had to work and analyze them.
Once your language is at a decent level there is so much you can get out of movies.

For example:
You can observe the body language of actors who find themselves in different emotional situations. People of different cultures all have slightly different ways they react to the circumstances they find themselves in. You will find out how the actors use intonation to express their emotions when speaking.
With this method you will really get the native flow of the language.

www.youtube.com/watch?v=4lzDNyL83ro

I would be eternally grateful to those willing to help a struggling language learner. 

I’m primarily interested in learning Japanese to a decent standard, and stopping there for the interim as far as additional languages are concerned – although I’ve very briefly listened to some Korean music (which seemed nonsensical to me), and looked at some related resources.

That said, like many other British students, I was forced to learn a second European language (French, in my case) during my time in secondary education (I’m 20, and currently studying CS at university) – and felt it to be a fairly pointless exercise in learning a skill that I’ll never use, then. I also spent several years trying to study Japanese on-and-off, in various different ways – but nothing really “stuck”, unless a few Kanji and Kana from song titles/artist names, and a fairly small lexicon of common words counted.

I’ve forgotten most of that French knowledge, since – but I feel that I’ve learned (and retained) more Japanese, after beginning a variant of AJATT, at the start of the year; and actually found practical use for that knowledge. (Mostly understanding technical blog posts, podcasts, and TV shows; and having short discussions – although I’ve found myself occasionally either dropping in English words, or resorting to continuing in English, when I hit the limits of my Japanese vocabulary).