Bluegrass musician Bill Monroe, whose repertory, views on musical collaboration, and vocal style were influential on generations of bluegrass artists, was also an inspiration to many musicians, that included Elvis Presley and Jerry Garcia, whose music differed significantly from his own.


(A) were influential on generations of bluegrass artists, was also an inspiration to many musicians, that included Elvis Presley and Jerry Garcia, whose music differed significantly from No obvious grammatical errors but very awkward wording used: "influenced" is better than "were influential on", "also inspired" is better than "was also an inspiration" and "including" is better than "that included". I would go with this only if all other options have obvious errors. For now, eliminate.


(B) influenced generations of bluegrass artists, also inspired many musicians, including Elvis Presley and Jerry Garcia, whose music differed significantly from Perfect ! All the mentions above are corrected and no other errors introduced.


(C) was influential to generations of bluegrass artists, was also inspirational to many musicians, that included Elvis Presley and Jerry Garcia, whose music was different significantly in comparison to Need plural verb "were influential" to refer to multiple factors (which itself is awkward, as we have seen above), not "was influential". Also includes other awkwardly worded elements. Eliminate.


(D) was influential to generations of bluegrass artists, also inspired many musicians, who included Elvis Presley and Jerry Garcia, the music of whom differed significantly when compared to Same SV error as in (C). Also, "the music of whom" is awkward - "whose music" is much better. Eliminate.


(E) were an influence on generations of bluegrass artists, was also an inspiration to many musicians, including Elvis Presley and Jerry Garcia, whose music was significantly different from that of "that of" is redundant here. Other awkwardly worded elements are there such as "also an inspiration to..." and "were an influence on...". Eliminate.