The band's debut album 'Silent Alarm' will turn 10 next year
Track is taken from Bloc Party frontman's forthcoming solo album 'Trick'
Frontman to follow 2010 debut 'The Boxer'
"The people who are reaping the greatest rewards from black music are not black" he writes
'Down Boy' will be put out in aid of music therapy charity Nordoff Robins
Frontman describes working on the mix as "like having an affair"
The Maccabees, Cat Power and Tim Burgess also performed at the first day of the Suffolk festival
Bloc Party are now on hiatus but bassist Gordon Moakes insists the band will be sustained by their love of music
Macabees, Cat Power and Tim Burgess will also appear