Here are some great songs by, in my opinion, one of the best rappers nowadays when it comes to actual hip hop. One of the few rappers who still focus a lot on the message of a song. Therefore, make sure you pay attention to his lyrics. If you don't feel like listening to all of these songs, please listen at least to the first one - an older song of Common, but the lyrics are really worth gold. I don't think anyone could write a better "summary" about the evolution of hip hop!
Common - I Used To Love H.E.R.
http://www.youtube.com/watch?v=C99iG4HoO1c
Common - The People
http://www.youtube.com/watch?v=S7B2VgRShew
Common ft. The Last Poets - The Corner
http://www.youtube.com/watch?v=6mnKNr2Tiq8&feature=channel
Common ft. Lily Allen - Drivin' Me Wild
http://www.youtube.com/watch?v=M6Mj6wPgQso&feature=channel
Common - GO!
http://www.youtube.com/watch?v=YCe1gC5VaW4&feature=channel