Tupac Resurrection Soundtrack (Amaru, 2003) by 2Pac

This is really more of a compilation album than a soundtrack, a few songs don't even appear in the movie.  However, they're still great records that prove the staying power of Tupac's music ("Holler If Ya Hear Me," "Bury Me a G" to name a few).  "Runnin' [Dyin' to Live]" is the crown jewel of this album.  It's one of the best songs Eminem has ever produced (props to "Lose Yourself" as well).  Unfortunately, Loyal to  the Game which also paired Em's production with 2pac's beats wasn't quite as good in my opinion.

Greatest Hits (Amaru, 1998) by 2Pac

Greatest hits albums are usually terrible.  Not that the actual music is bad, but it is just a collection of hits with a few rush-recorded tracks by an artist to fulfill a contractual obligation.  Therefore, there is very little incentive to purchase them if you are already a fan of the artist.  However, in this case, there is an exception.  2Pac was a prolific writer and recorder.  There are four unreleased tracks here (as well as the original version of "California Love").  And some of the unreleased tracks are the best ones on this 2-CD set ("Unconditional Love" and "Changes").  The sequencing of the compilation is also done well and the album provides a well-rounded glimpse into the mind of one of the most amazing artists that hip-hop will ever see.  {Writer's note: Because of a family emergency, I was unable to post for multiple days and so I am posting multiple times now to make up for it.  I apologize for any confusion and/or inconvenience.}