who is associated with the musical artists from olivia newton-john and olivia newton-john ?
SELECT DISTINCT var_uri where brack_open var_uri dbo_associatedMusicalArtist dbr_Olivia_Newton-John sep_dot var_uri dbo_associatedMusicalArtist dbr_Olivia_Newton-John sep_dot var_uri a dbo_MusicalArtist brack_close