It's bad idea to study by songs, it's better to watch movies with subtitles. Don't waste your time, songs - is not real english

What kind of music that you like miss Aiko? Pop music or rock music? If you are into Pop then you better listen to N Sync or Backstreet Boys songs, and if you are into rock music, you better listening to Bon Jovi songs

I love learning with songs, I used to do it a lot, I think that is good to earn more vocabulary and pronunciation. I recommend The Beatles/Queen because it easy to understand the pronunciation

It really depends on what type of songs you like.. I would recommend Lenka, she is an Australian singer.. She is easy to understand and her songs are wonderful and happy.
🌞😀 When it comes to male singers, listen to Ed Sheeran.. ☀️ It all boils down to what kind of music you like. 

I think learning english by listening songs is really suitable to improve our vocabulary as much as possible also learning how to pronounce some words.