There is such a wide variety of 'Successful' singers on the scene , and all have different qualities to their voices , from the Ronnie Drew (Gargling with Industrial Diamonds) to Dave Burland !
I have the same problem as SPB - I learn a song from another singer and so often find I AM imitating ! OK - The song goes on the back burner for a while until I can sing it out as 'Me' , not Them !