Bachman-Turner Overdrive?

Tom Petty and the Heart Breakers?
Bruced SPringsteringer and the E-street band?

Annie Lennox is in the band The Eurythmics? She is/was the Eurythmics.
ELO replacable parts, Jeff Lynne was the band

I guess the problem I have is that some artists are the band, the other parts easily replaced and others are not.

Pure Band...
Rush
ZZ Top
Steely Dan (Donald Fagan needs his guitarists or its not the same)