>>Freddie Mecury - he had a range of four octaves - nobody else comes close<<
Ian Gillan of Deep Purple probably had a bigger range. Listen to Child In Time from their Made In Japan album. Having a great range helps but it doesn't translate into a great singer...
Freddie Mercury and Rod Stewart are great singers. They not only have the voice but also connected with the audience in magical ways!
I don't know how you can seperate the voice from the performance. Some voices work "just right" for a particular song but won't sound great with other songs. For example, Janis Joplin and Joe Cocker have great voices - but for their genre only.
David Coverdale (also from Deep Purple) doesn't have a great range but I can't imagine a better voice for Soldier Of Fortune. Then you have the "screamers" at a dime a dozen. Great range but for the most part no music. So is that great singing?!
How about memorable rock voices? I already mentioned David Coverdale in Soldier Of Fortune. Add Janis Joplin in Summertime, Rod Stewart in Sailing (live), Robert Plant in Stairway To Heaven, Freddie Mercury in Bohemian Raphsody, Margo Timmins in Helpless and many more...
