How To Improve Pronunciation

As you might know, it's not easy for non-native English speakers to pronounce English properly. I have been struggling with the problem, but I find singing English songs useful to me. I'm not sure if this method is effective for everyone, but it works for me.
I need to pronounce English like native speakers when I sing English songs. This is like imitating. I have learned how to make the correct stress and intonation while singing English songs. There are some methods to improve your pronunciation, so you can choose the best way. I love singing and enjoy karaoke. I often listen to Western songs and sing along with them for a change. Singing is refreshing and helps me improve my pronunciation. This is exactly what "kill two birds with one stone" means, isn't it?

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The last sentence was a fragment and sounds a bit more natural the way I've reworded it.  At any rate, what you wrote was fine for colloquial spoken English.  

Technically, the "isn't it" at the end of the sentence should be avoided in written formal English, but it is fine for casual English.  A more formally correct version of the sentence would be something like as follows:

"Isn't this exactly what 'kill two birds with one stone' means?"

Once again, your English is very good and these are minor things.