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.

Lay down the crack pipe. The sound of the vocalists for each of these groups is a significant reason these groups made it as big as they did. While none of the guys you mentioned may be selected as having the best male singing voice, they were all extremely talented vocalists.

I always bought the singer was the worst part Rage Against the Machine. Screechy whiny voice.

AC/DC definitely

Rush would benefit tremendously

Keep Plant

Prince would have made all the difference in Milli Vanilli.

I wish BOC had found better singers than Eric Bloom and Buck Dharma. I think the band's stature would've been much greater with a highly distinctive voice suitable to their songs.