The six hundred and sixtieth album: #660 De La Soul - 3 Feet High and Rising
The legal issues surrounding sampling really changed the face of hip hop, where this older album really uses a lot of it - songs made up of samples, with few or no original vocals included, mixed with songs with rap tracks that have the sound and feel of the era, without complex lyrics. It's not a challenging album but it's got a good party vibe to it.