Shares of Pandora Media (NYSE: P) are getting whacked after hours Tuesday following the company's fourth-quarter 2012 results. While the quarterly results are certainly weighing, investors are likely focusing on first-quarter and FY13 guidance which seems very concerning.

Revenue for Pandora rose 71 percent from $47.64 million reported in the same period last year to $81.33 million. Pandora reported a wider loss of $8.18 million, amounting to 5 cents per share. Excluding stock-based compensation, Pandora's loss narrowed to 3 cents per share.

The Street was looking for revs of $83.0 million and a loss of 2 cents per share.

Pandora reported total listener hours nearly doubled from 1.3 billion in the prior year to 2.7 billion. Subscription and other revs rose 51 percent to $9.2 million.

Looking ahead, Pandora sees first-quarter revs of $72 million to $75 million and non-GAAP loss of 21 cents to 18 cents per share. The Street sees revs of $86.6 million and a loss of just 2 cents per share.

Pandora sees FY13 revs of $410 million to $420 million and a loss of 16 cents to 11 cents per share, versus expectations for revs of $481.3 million and earnings of 1 cent per share.

Pandora shares are about 15 percent lower in the after-hours session Tuesday.

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