The Associated PressNEW YORK (AP) ¿ The following stocks were among those that moved substantially or traded heavily Tuesday on the New York Stock Exchange: NYSE: Warner Music Group Corp., down 86 cents at $6.20 The recording company posted an unexpected loss in the fourth quarter on severance costs despite a strong slate of music releases. Barnes & Noble Inc., down $1.27 at $22.25 The bookseller posted a larger loss than last year and lowered its profit forecast on high costs to launch its electronic book reader. Windstream Corp., down 5 cents at $10.08 The phone company bought carrier Iowa Telecommunications Services Inc. for $1.1 billion in cash, stock and repayment of debt. Medtronic Inc., up $2.94 at $43.25 The company reported a surprising boost in profit, as increased sales of implantable heart devices defied reports of weakening demand. Hewlett-Packard Co., down 83 cents at $50.19 The company's cost-cutting and push into new markets is helping soften the blow from weakness in the company's mainstay businesses. American Eagle Outfitters Inc., up 47 cents at $15.01 The apparel retailer<s profit climbed in the third quarter as the prior-year period was weighed down by an impairment charge. NASDAQ: Brocade Communications Systems Inc., down 70 cents at $7.10 The company said revenue will be weaker in the first quarter, while an overall rebound isn't expected until the end of the fiscal year. Peet's Coffee & Tea Inc., down 20 cents at $32.86 Green Mountain Coffee Roasters sweetened its offer for Diedrich Coffee by $2 per share, matching a rival bid from Peet's.