who knows 2 same pieces of music but have different performers?

Answer 1

I wonder if the National anthem would count, or God Save the Queen?

I love opera, and have seen Verdi operas many times, with different singers. Maria Callas is one that my brain remembers, but there have been others, you can search on You tube.
http://www.youtube.com/watch?v=SWAQvpPDTuU

Answer 2

can you give me two different performers who sing god save the queen?

Answer 3

https://www.google.com/#q=performances+of+god+save+the+queen

Watch and read ... MANY of these!