Digital music retailer Amie Street has raised $3.9 million in a round of funding, according to an SEC filing. Amie Street prices its catalog of more than one million songs based on their popularity; tracks start out free and then cap out at 98 cents as more Amie Street users download them. Amazon (NSDQ: AMZN) led a first-round investment in Amie Street two years ago. Last October, when the Amie Street website got a facelift, the company disclosed that it was raising a second round of funding from existing investors. The company says in the SEC filing that it will use proceeds of this round for “general working capital purposes.” The filing lists Deep Fork Capital managing partner Tim Komada as a director.

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Update: The company’s officially announcing the second round tomorrow. lt was led by Deep Fork Capital, which included the conversion of a bridge note issued earlier by Deep Fork, and included additional investments from three other unnamed investors. Amie Street recently announced several music licensing agreements, including its first major label deal with Sony (NYSE: SNE) Music Entertainment, and says it now has over 1.5 million songs available for download.