LOS ANGELES (Reuters) - Hell hath no fury like Joni Mitchell on the subject of the music industry. The veteran singer/songwriter, on the promotional trail for a new album, says she is "ashamed" to be part of the music business and may stop recording. "I just think it's a cesspool," the 58-year-old folk-rock icon said in the latest issue of Rolling Stone magazine. "I hope it all goes down the crapper. I would never take another deal in the record business, which means I may not record again, or I have to figure out a way to sell over the...