In October 2003, Jaa9 & OnklP released the album, Bondegramatikk – the Mixtape, a collection of old and new tracks, put together by Poppa Lars and DJ Ross, including a version of Busta Rhymes' "I Know What You Want".

After the independent mixtape Bondedramatikk – En Gateplate, in 2008, they were signed to Sony Music and released the album Sellout!

Johnny Engdal Silseth (born in Valsøyfjord on 2 March 1982), best known by his stage name Jaa9 is a Norwegian rapper.

Besides his partnership in Jaa9 & OnklP, he released his own solo album Det kunne vært deg on Pass It record label.

He has cooperated with other artists as well, notably with Oslo Ess in Fritt Fram in 2012 and in 2014 returned with an album Onklp & De fjerne slektningene.