Oliver Nelson is one of the all time great jazz arrangers, and this album is incredible. The first track alone is worth the price of admission.
Also, Miles Davis' Kind of Blue is considered a great introduction to jazz, but not many casual jazz listeners realize that the album Somethin' Else by Cannonball Adderly was not only recorded around the time of kind of blue, but also features many of the same players. You can almost view the two albums as companion pieces.
Everyone talks up Coltrane, and with good reason -- however if there could only be one album to introduce him by it would have to be Live at Birdland. It is entrenched in melodic beauty and pure soul from beginning to end -- very accessible.