Combining both jazz and blues in a single list? I can't do it; thus, here is a list of 7 of each. While this bears some relation to lists previously posted, in my view, classic blues albums have been conspicuously underrepresented in favor of jazz:
Jazz:
(1) Bill Evans: Waltz for Debby
(2) Miles Davis: Kind of Blue
(3) Dave Brubeck: Take Five
(4) Getz / Gilberto
(5) Buena Vista Social Club
(6) Cannonball Adderley: Something Else
(7) John Coltrane: A Love Supreme
Blues:
(1) Blind Lemon Jefferson: The Complete Recordings
(2) Charley Patton: The Definitive Charley Patton
(3) Muddy Waters: Folk Singer
(4) Buddy Guy: I Was Walking Through the Woods
(5) Son House: Father of the Delta Blues
(6) Elmore James: The Sky is Crying
(7) Leadbelly: King of the 12 String Guitar
Jazz:
(1) Bill Evans: Waltz for Debby
(2) Miles Davis: Kind of Blue
(3) Dave Brubeck: Take Five
(4) Getz / Gilberto
(5) Buena Vista Social Club
(6) Cannonball Adderley: Something Else
(7) John Coltrane: A Love Supreme
Blues:
(1) Blind Lemon Jefferson: The Complete Recordings
(2) Charley Patton: The Definitive Charley Patton
(3) Muddy Waters: Folk Singer
(4) Buddy Guy: I Was Walking Through the Woods
(5) Son House: Father of the Delta Blues
(6) Elmore James: The Sky is Crying
(7) Leadbelly: King of the 12 String Guitar