Original sentence: The bulk of the band's conceptual ideas, as well as their songwriting, came from the quartet of singer Keith Relf, drummer Jim McCarty, rhythm guitarist/bassist Chris Dreja, and bassist/producer Paul Samwell-Smith, all of whom co-wrote the Yardbird's original hits and constituted the 'core' of the group
Edited sentence: However, as easy as it may be to tag the Yardbirds as merely a lead guitarist's roost, the bulk of the band's conceptual ideas, as well as their songwriting, came from within the unsung braintrust of singer Relf, drummer McCarty, rhythm guitarist/bassist Dreja, and bassist/producer Samwell-Smith - all of whom co-wrote the Yardbird's original hits and constituted the 'core' of the group (with the added sparkle of an ace lead guitarist or three on top)