When Paul Revere, the man that put together Paul Revere and the Raiders band, left the band, the band just isn't the same anymore. It was his health that made him quit the band. When rock group, Journey, lead singer, Steve Perry left the group, to me Journey was gone. The new lead singer just couldn't match Perry's voice. When David Lee Roth left Van Halen and Sammy Hagar took over as lead singer, again, the band was gone for me. I was never a fan of Sammy Hagar. Artists that start a solo career, lose my interest as well. Ann Wilson, Phil Collins are a couple. I love the bands, Heart and Genesis, with them in. The girl that took Grace Slick's place in Jefferson Starship, just can't compare to Grace's voice. Deep Purple is a great rock band, but when Ritchie Blackmore was with them as lead guitar player, the group was fantastic. There are other rock band members that have either left their highly notable band or passed-away where the band no longer sounds the same. Do you know any?