Example, Annie Mac, more for We The People 2011
They join The Streets and Chase & Status on bill
Also set to appear are Doom, Beardyman, Redlight and Yasmin.
They're joined by Ultramagnetic MCs, Roots Manuva, The Gaslamp Killer and Giggs.
Completing the latest additions are Engine Earz, Modestep, High Rankin, Dot Rotten and Smerins.
We The People 2011 takes place at Bristol Harbour from 4-5 June.
10,000 people are expected to attend the south-west weekender, which will have three stages of live music from the best contemporary and progressive acts.
There will also be after-parties arranged for each day, the details of which will be announced at a later date.
Early bird tickets are available now priced at £35 plus booking fees for a day or £60 plus booking fees for the weekend.
Click here to buy We The People tickets.
Tickets are for over-18s only and there is no camping available, however, there are a number of hotels nearby, which can be found on the official Bristol tourism website.