He'll release a song a day all next week
Butler lined up alongside celebrities including Kevin Hart and Sarah Silverman
Frontman will work at a branch of La Colombe tomorrow (Februrary 14)
Butler's solo album 'Policy' will be released March 16
Frontman had previously expressed an interest in playing
Arcade Fire guitarist to play four UK dates in April
Proceeds from sales will go to the Partners in Health and Haiti Coffee Academy charities
Tour in support of singer-guitarist's forthcoming album
Solo album 'Policy' will be released on March 16
Butler will release 'Policy' in March 2015