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- "Officially Missing You (MIDI Mafia Remix)" by Tamia ("Officially Missing You (The Remixes)," 2003)
- "Oh My Stars" featuring Musiq Soulchild (Eardrum, 2007)
- "Old School" by DANGERDOOM (The Mouse and the Mask, 2005)
- "On Mission" by Reflection Eternal (Soundbombing 2, 1999)
- "On My Way" by Reflection Eternal (Train of Thought, 2000)
- "One-Nine-Nine-Nine" by Common; featuring Sadat X (Soundbombing II, 1999)
- "One Four Love (Part 1)" featuring Common, Doug E. Fresh, Kool G Rap, Mos Def, Pharoahe Monch, Posdnuos, Rah Digga, Shabaam Sahdeeq and Sporty Thievz (Hip Hop for Respect EP, 2000)
- "Outside the Lounge" featuring Building Block, Lil' Sci, Mr. Metaphor, Shabaam Sahdeeq and Wiseguy (Lyricist Lounge, Volume One, 1998)
- "Over the Counter" with Madlib (Liberation, 2007)
- "Oz Theme 2000" featuring Kool G Rap and Lord Jamar (Oz Original Soundtrack, 2001)
Read more about this topic: List Of Talib Kweli Songs