I think that music is the most universal language.  I want to know the songs to of the world and now it is easier wiht with the internet. Tonight I´m contemplating (I want to say listen + reflect ) listening a piece interpreted by two people that they who were born far away, in different countries, many different cultures, each one had with their native language but I can´t hear their accents when play together.

I don't understand what you mean by "I can´t hear their accents when play together", do you understand both languages? 

I think maybe you mean "I can't understand them when they sing together"  ?