Karen Elson is a singer .
During this time , Marshall contributed guest vocals on several other projects : She performed a duet with singer-model Karen Elson on an English cover of Serge Gainsbourg 's `` Je t'aime ... moi non plus '' for the tribute album Monsieur Gainsbourg Revisited ( 2007 ) ; sang lead vocal on the Ensemble track `` Disown , Delete '' ; and contributed to a reworked version of `` Revelations '' with Yoko Ono for Ono 's 2007 album Yes , I 'm a Witch .
Cat Power