Last three songs of pet sounds are stunning (I Just wasnt made for these times, pet sounds, caroline no), Golden Slumbers/Carry That Weight/The End from Abbey Road?...
How about 'Desolation Row' on highway 61 revisited??...not 3 songs, but it is 11 mins...
The second side of The Wild, the Innocent & the E Street Shuffle by Bruce Springsteen?
From some more modern albums, I might choose the last 3 tracks of Wilco's 'A Ghost Is Born', or of 'Helplessness Blues' by Fleet Foxes..
Oh, the closing trio of Arcade Fires debut was pretty awesome (Haiti, Rebellion, In the Backseat)
Or No Surprises/Lucky/The Tourist
the thing is, the standard of songs on all those albums, ziggy included, was so consistent all the way through it is debatable which songs really are the best. At least 2 of my bandmates would put 'Startman' among the best on ziggy....