re: Would a different lead singer make these groups songs even better.

AC/DC, Rush, and Zep have an unmistakeable sound, and that is why their music has stood the test of time. I don't believe they would have been as successful with a different sound, and look at all the great music all three have provided us down through the years.

Queen has never recovered from losing Freddie. As good as May and Taylor are, or any guest singers, they can't really do justice to the music the way Freddie did, and haven't recorded a true album without him.

Journey replaced Steve Perry with that kid that sounds exactly like him. What a fortunate stroke of luck for them! That sound must work for them.