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Mercer performing at the Fillmore in San Francisco, July 2009
|Birth name||Kelvin Mercer|
|Also known as|
|Born||August 17, 1969|
The Bronx, New York, U.S.
|Labels||Tommy Boy, Sanctuary, AOI|
|Associated acts||De La Soul|
Kelvin Mercer (born August 17, 1969) is a rapper, producer, and one-third of the hip hop trio De La Soul. He is known more famously by his alias Posdnuos, or simply Pos. He was born in the Bronx, New York and grew up in East Massapequa, New York.
He is a member of the Spitkicker collective.
Cameos and album appearances
|1998||Propellerheads' Decksandrumsandrockandroll, on the track "360° (Oh Yeah?)"||With De La Soul|
|2002||Mint Royale's Dancehall Places and Pop Is..., on the track "Show Me"|
|2006||Oh No's Exodus into Unheard Rhythms, on the track "Smile a Lil Bit"|
|2007||LA Symphony's Unleashed, on the track "Universal"|
|2008||Jake One's White Van Music, on the track "Oh Really"||With Slug of Atmosphere|
|2009||Dan Le Sac Vs Scroobius Pip's re-release of Thou Shalt Always Kill|
|2011||Official remix of Mac Miller's song "Of The Soul"|
|2013||Wrekonize's The War Within, on the track "Church Road"|
|2014||Stalley's Ohio (Stalley album), on the track "Navajo Rugs"|
|2015||Étienne de Crécy's Super Discount 3, on the track "WTF"||With Dave|
|2015||Hot Chip's Why Make Sense?, on the track "Love Is the Future"|
|2017||Gorillaz' Humanz, on the track "Momentz"||With De La Soul|
All three members of De La Soul have used a number of aliases. The following are the most significant:
- Posdnuos – Pronounced "pas-da-noos". The name may be a combination of the reversed words "Sop," meaning "leftover," and "Sound," a name Mercer went by while acting as a high school DJ. According to some sources, the fact that the words spelled backward are "sounds op [i.e., operative]" is intentional. 
- Plug One – An early concept for 3 Feet High and Rising involved music being transmitted from Mars by three microphone plugs (each one representing a member of the group). Though this idea was abandoned, the titles "Plug One", "Plug Two" and "Plug Three" still became relevant on the album. Mercer's title of Plug One would eventually evolve into Plug Wonder Why, which has been shortened to Plug Won.
- Mercenary – Derived from the last name, "Mercer". This name was given to him by DCQ, brother of Mos Def.
- P-Pain – Caricature of the rapper T-Pain. He uses this alias in the song Supervillainz by DOOM.
- DJ Shadow (September 23, 2011). "DJ Shadow: The Internet Is Not Your Savior". Wired.com. Retrieved September 23, 2011.