by Mike Krumboltz We haven't heard much from singer Jewel lately. Or maybe she's just been in disguise. The incredibly popular folk singer and part-time yodeler went undercover at a Los Angeles karaoke bar to sing some of her best-known songs to a confused and delighted audience. With a crew in tow from Funny Or Die , the singer played the part of a mild-mannered business woman named "Karen," who had to be egged on to take the stage and sing.