Essential Rap and Hip-Hop Songs

This guy wants to know what rap and hip-hop songs are essential listening. Here is my list of tracks, in rough chronological order from the late 70s to today, that represents the best and most influential songs and artists in rap. Together, they form a pretty concise history of hip hop (and would make an awesome three-disc set). Obviously some great songs and artists are left off of this list, but I think this is a good start.

"Rapper's Delight" - Sugar Hill Gang
"The Breaks" - Kurtis Blow
"The Message" - Grandmaster Flash & The Furious Five
"The Show" - Doug E. Fresh & The Get Fresh Crew
"It's Like That" - Run-DMC
"Peter Piper" - Run-DMC
"Paid in Full" - Erik B. & Rakim
"Raw" - Big Daddy Kane
"South Bronx" - Boogie Down Productions
"You Gots to Chill" - EPMD
"Hey Ladies" - Beastie Boys
"Children's Story" - Slick Rick
"Me Myself and I" - Del La Soul
"Check The Rhime" - A Tribe Called Quest
"Fuck Tha Police" - NWA
"Fight the Power" - Public Enemy
"Insane In the Brain" - Cypress Hill
"It Ain't Hard to Tell" - Nas
"Rebirth of Slick (Cool Like Dat)" - Digable Planets
"Nuthin' But a 'G' Thang" - Dr. Dre
"All Eyez On Me" - 2Pac
"Who Am I? (What's My Name?)" - Snoop Doggy Dogg
"Definition" - Black Star
"Big Poppa" - Notorious B.I.G.
"Rosa Parks" - OutKast
"Hip Hop" - Dead Prez
"C.R.E.A.M." - Wu Tang Clan
"Everything is Everything" - Lauryn Hill
"My Name Is" - Eminem
"Hard Knock Life" - Jay-Z
"Country Grammar" - Nelly
"Quality Control" - Jurassic 5
"In Da Club" - 50 Cent
"Through the Wire" - Kanye West