Liberal apparatchik and part-time lounge singer Mike Witherly, who most recently worked as Senator Jack Austin's assistant, will soon be serenading the prime minister. Starting Monday, Mr. Witherly, who provided the musical accompaniment for Martinite staffers Ann Wicks and Tony Roy's wedding, will be heading up Paul Martin's western desk. Prime Minister's office spokesman Justin Kingsley confirms that position was previously occupied by Bruce Young, who used to head up Hill & Knowlton Inc.'s British Columbia office. In addition to having a musical background, Mr. Witherly was chief of staff for the Liberals in British Columbia and a spokeperson for the party during the recent election campaign.