who is associated with the musical artists from mika and carrie underwood ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_associatedMusicalArtist dbr_Mika_ attr_open singer attr_close sep_dot var_uri dbo_associatedMusicalArtist dbr_Carrie_Underwood sep_dot var_uri a dbo_MusicalArtist brack_close