Biffy Clyro and Adele have been unveiled as additional headliners at the Mencap Little Noise Sessions charity concerts in London next month.
Both acts join existing headliners Kasabian, Razorlight and Keane at the gigs, which will take place at the Union Chapel in Islington.
New acts who have also been added to the line up include Friendly Fires, White Lies, The Hours and Florence and the Machine.
Organisers have promised that some special guests will join the event following last year's secret performance from U2's Bono and The Edge.
Registration for tickets is open now and will run until October 19th via the Mencap Music website.
All ticket proceeds from the concerts will go to the charity, which is the leading UK charity for people with a learning disability and their families.
You can keep up to date with all the latest news from Gigwise by following us on Twitter and liking us on Facebook.

BBC Denies Burying Jimmy Saville Sex Abuse
Katy Perry Unveils New Single 'Part Of Me' - Listen
Plan B's 'iLL Manors' Movie Labelled As 'Horrific'
Adele Gets Go-Ahead To Perform At Grammy Awards
Biffy Clyro Praise Liam Gallagher For His 'Outspokenness'
Biffy Clyro: Double Album Is A Change Of Direction
The 15 Best B-Sides Of All Time
M.I.A Demands Women In Burkas: Ridiculous Rock Star Riders!
Dry The River, All The Young Play Manchester Ritz