I didn't listen to songs with English lyrics. I just listened to instrumental music. Even though I hadn't heard any English sounds, my listening skills were improved for an English language. I was wondering how it had happened.
I decided to analyze my hearing process and I discovered an interesting phenomenon. Usually, I regard English as a second language. However, after hearing music for a while, I felt that English conversation was like music.
The vowels was like a series of the pitch of sounds and the consonants was like noises made by percussions. I noticed that I could hear English conversations as interesting music with melody and rhythm.
It might be a key point to listen to a second language.