Had it - Lost it

Some bands have "it". The magic, the spark, then lose it. What bands fit or any that never lost "it"?
Example: Did The Beatles ever lose it or did they fold up early enough to dodge burn out?
Only band I can think of that kept the raw energy through their whole career would be Queen (with Mercury).
Example: Did The Beatles ever lose it or did they fold up early enough to dodge burn out?
Only band I can think of that kept the raw energy through their whole career would be Queen (with Mercury).